How To Fix Error 0x800705b4 Windows Defender in Windows 10 & 8

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Get fix to error 0x800705b4. It is generally associated with Windows Defender and Window Update. WD is a freeware which comes with Windows8 and 10 by default. Its application is to protect the computer system from threats like malware and spyware.

It is a handy and easy software. It eliminates the requirement of some other 3rd party security software for protection. But, at some times, Win users come across a 0x800705b4 error which causes Windows Defender to stop working. Though it is free, it’s an excellent security program.

Fix Error 0x800705b4

The Defender of Win works the same as other paid software. But, there is always the possibility of error(s) through which viruses/malware can penetrate. Thus, we need to resolve all the issues to create a fully secure system.

Error 0x800705b4 – Cause/Reason

Usually, it arises when an another 3rd party protection software/service is working along with Windows Defender. The other installed software results into a conflict between the two programs performing the same functions. So, you need to remove the third party program. Uninstall it to allow Windows Defender to work properly.

Fix Error 0x800705b4 – Solutions

There are various solutions which you can apply to get Windows Defender back in its working state. However, disabling or uninstalling the second or the manually installed antivirus and/or firewall is the best option to solve the issue. Following are the steps to do it.

After doing it, make sure that Windows Firewall is turned on. You can check it inside the Control Panel.

  1. Hold Window key and press X. Click on the Control Panel on the opened list. Select Windows Firewall and click on Turn Window Firewall On or Off on the left side. Then, turn the Firewall On if it isn’t. After that, Press OK.
  2. Open Windows Services Panel by typing msc inside the Cortana search field. Right click on it and Run It As Administrator.
  3. Search for WindowsDefender in the Services panel. Look for its Status in the right column. If it’s blank, right click on Windows Defender in the list and select Start. If it doesn’t start, change it to Automatic.
  4. Then, restart the computer again. And check if the problem is resolved or not.

Related: Fix Error 0xc000021a

Additional Methods to Fix Error 0x800705b4

Refresh Windows

  1. Open Settings by pressing WindowsKey and click on ‘Settings’
  2. Click on Update & Security
  3. Click on Recovery and then on Restart Now present under Advanced Startup
  4. Click on Troubleshoot and select Reset This PC
  5. Select Keep My Files. If it asks, select an Administrator Account of which you can provide credentials for. Enter the password and click OK.
  6. Insert a Windows 10 installation media, if it asks. And continue the process
  7. Select the Windows10 installation which you need to refresh.
  8. Then, click on Reset to start the process.

It will take a while to finish refreshing Windows 10. The PC may restart a few times during it. Once done, sign into Win 10. Each user will go through the first start up again before seeing their desktop.


  1. Press Windows key and X button at the same time.
  2. Click on Command Prompt and run it as administrator.
  3. Type sfc /scannow and press Enter

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After some time, the sfc /scannow results will appear in the cmd from the following ones.

  1. Windows did not find any integrity violations
  2. Window Resource Protection found corrupt files and repaired them
  3. Windows Resource Protection found corrupt files but was unable to fix some (or all) of them

It’s recommended to run SFC 3 times to ensure all problems are fixed. Hope, 0x800705b4 error gets resolved by now.

How to fix error 0xc000021a in Windows 10 and 8?

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Here’s how you can fix error 0xc000021a which usually comes in Windows 10 and Win 8. These newer versions of Microsoft Windows operating systems (OS) arrived with a number of issue and problems at the time of launch. After some time, the company pushed updates with time.

Majority of errors were resolved, but a handful of them was left intact. One of those is associated with the hex code 0xc000021a. Further, this code states “Your PC Ran Into A Problem and Needs To Restart.” It comes inside a Blue Screen of Death (BSoD) error. It looks a little different in Windows 7 and states “An error has been detected.”

Fix Error 0xc000021a

These BSoD errors have the ability to seriously damage the internal structure of Windows OS. It doesn’t usually solve even after restarting the PC. At times, performing a system restore may not work. So, you should know the real cause behind the error message and then, its solutions.

Reasons / Cause of the Error 0Xc000021A

The main cause behind it is the Windows updates. After getting updated, it doesn’t boot to Windows and the error code 0xc000021a comes on the blue screen of death. The reason behind it is the following two files.

  1. winlogon.exe: This file is associated with the login and logout operations of Windows. Sometimes, it gets damaged due to mismatch of System Files or 3rd party software. When the file damages, error causes the PC to boot to the Windows login.
  2. csrss.exe: This file belongs to Microsoft server / client. Sometimes, it also gets damaged.

Related: Error Code 0x80070426.

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Solutions to Fix the Error 0Xc000021A

Following are the solutions. These will fix the 0xc000021a error.

Solution # 1: Repair Corrupt System Files

Reimage Plus can help in this case. You need to download and run it. Click here to scan for corrupt files. If corrupt and missing files are found, repair them.

Solution # 2: Booting Windows Manually

Try and boot Windows manually. Boot in safe mode using force drivers to have the signature disabled option available in Advanced Boot Options. Follow the listed steps to do it.

  1. Restart the PC by pressing Shift key + clicking on the Restart button. If you can’t access Restart option, you will need to boot the Windows using a WIndows bootable USB.
  2. An option screen will open. Click on Troubleshoot to open the advanced tools.
  3. Then, click on the Advanced option.
  4. Click on Startup Settings.
  5. A number of options will appear. Select ‘Press F7 labeled as Disable Driver Signature Enforcement.’

Now, the PC should restart with the selected option. While booting up, a number of different options will appear, you can tweak your PC now.

Solution # 3: Fix the Issue using SFC Scan

If the above method doesn’t work, you can employ System File Check Scan (sfc scannow) to resolve the issues. The scan will fix the corrupted files from the cached copies. Run a full SFC can on your PC.

Method # 4: Reset the computer’s BIOS

Many users fix the issue by resetting the BIOS. It can be done simply by removing the CMOS battery from its motherboard for a couple of minutes. Before opening the computer’s chassis, make sure it’s not connected to electricity by any power cable. However, this trick won’t work with laptops as their motherboards are not readily accessible.

Method # 5: Replace any and all corrupted registry hive files with backups

When a computer starts or reboots, it tries to access the essential registry hive files, but couldn’t because they may have been damaged or corrupted. Try to replace any (and all) corrupted registry hive files with their backups. It should fix the issue.

In case, your computer doesn’t (or won’t) start/boot up, you won’t be able to able to replace them via the File Explorer. The workaround is using a Command Prompt in the Windows Recovery Environment.

To access Windows Recovery Enhancement, you will need a Windows installation USB or disc with the same version of Windows as the once installed on your PC.

Following are the steps which you need to follow:

  1. Restart the computer after inserting the windows installation disc or USB
  2. As the computer shows the first screen, get inside its BIOS settings and configure to boot from the installation media instead of its HDD/SSD.
  3. Save and Exit the BIOS
  4. If prompted, press any key to boot from the installation media.
  5. Select your language, time zone, and keyboard layout preferences, then click on Next
  6. On the Install Now button screen, look for and click on Repair your computer in the bottom left corner of the windows.

It will make you reach the Startup Options screen. Then, you need to perform the following steps.

  1. Click on Troubleshoot > Advanced Options.
  2. Click on Command Prompt
  3. Type ‘c:’ command in cmd and press Enter. If you have installed Windows on a partition other than C drive, replace c with that drive letter corresponding to the part of HDD/SDD that has Windows installed on it.
  4. Then, type ‘cd windows\system32\config’ and press Enter
  5. Type ‘dir’ and press Enter. The list of all files and folders will appear on the screen.
  6. One by one (only for each file), type ‘ren (File name) (File Name).old’ command and press Enter.

For example: Type in ren SYSTEM SYSTEM.old for the SYSTEM file in the directory, and ren SECURITY SECURITY.old for the SECURITY file in the directory.

  1. After renaming each file (creating backups of all), type ‘cd RegBack’ in cmd and press Enter
  2. Type dir’ and press Enter. The names of all files and folders will appear.
  3. Now, you need to type the following commands in cmd one by one:


copy /Y SAM

copy /Y SYSTEM

and any other folder that was renamed. After that, we will now put the registry hives back for the folders we renamed.

Once the process is done, close the command prompt by typing Exit and pressing Enter. Then, remove the Windows installation media and restart the computer. And see if it boots up without running into the 0xc000021a error screen.

Stay connected to Windows Error Fix for fixes to more errors.

How To Fix Error Code 0x80070426 in Windows 10 / 7/ 8

Error Code 0x80070426

Error Code 0x80070426: You may know that Microsoft Security Essentials has been replaced by on-board Windows Defender in Windows 10. Around 10% times, the operating system version upgrading process fails when a user tries to upgrade Windows 7, 8, or 8.1 to Win 10.

In the successful attempts, WindowsDefender takes over Microsoft Security Essentials. But, sometimes it can’t take over MSE as something goes wrong. It results in the OS having both MSE and WD at the same time.

Fix Error Code 0x80070426

In such rare cases, Windows Defender fails to start. It means that inspite of being installed, it won’t be offer any kind of protection services to the computer. While, Microsoft Security Essentials will be up and running, but it will be Spyware & Unwanted Software Protection and Virus Protection both turned off.

In these cases, when we (users) try to properly run the program by turning ON the disabled protection options, the Microsoft Security Client pops up with the a dialog box. It says the following error message:

“An error has occurred in program initialization. If this problem continues, contact your System Administrator. Error Code 0x80070426.”

Usually, this error code 0x80070426 pops up when Windows finds a non-genuine copy. However, it doesn’t mean the same in this case. Here, the error 0x80070426 refers to MSE not being working currently as it is supposed to do.

Related: 0xc00007b Error Fix.

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At this point, you should fix 0x80070426 error as it completely leaves your computer open to most of the vulnerabilities. It’s because Windows Defender doesn’t start and MSE doesn’t work even after being active.

So, the simple and effective solution to this problem is uninstalling the Microsoft Security Essentials from your computer. It will then allow WindowsDefender to take up the job and protect the PC.

Follow the mentioned steps to fix error 0x80070426.

  1. Press Windows Key + R to open the run box.
  2. Type in ‘taskmgr’ and try to find the Windows Defender Service (WinDefend) in the task manager which opens.
  3. Locate it, then right click on it, and choose ‘Stop’
  4. WinDefend service will be stopped right there.

However, you should keep in mind that after restarting the computer, the service will automatically start. You need to do the rest of the work while the service has been stopped. Now, you should uninstall Essentials from the control panel.

Without stopping the service, you can’t uninstall and install such programs. It’s because Windows restrict users to make changes in its core files. Windows Defender restricts such processes.

After stopping the service, you must uninstall MSE. To perform uninstallation, follow the steps mentioned:

  1. Open Control Panel
  2. Click on Programs & Features
  3. Select Uninstall a Program
  4. Locate the Microsoft Essentials and click on Uninstall it.
  5. After uninstalling, you should restart the computer.

You can also open the control panel by holding Windows Key and R at the same time. When run box opens, type appwiz.cpl into it and press Enter. It will open the Control Panel.

After restarting/rebooting the computer, go to Settings -> Update & Security, and choose Windows Defender there. Also, make sure to enable Real-Time Protection, if it isn’t already.

And just for confirming, open Task Manager and go to Services tab. Check if Defender Service is running.

We hope that your problem is solved by now.

Stay tuned to Windows Error Fix for more solutions to problems.

How to Fix 0xc00007b / 0xc000007b Error (The Application Was Unable To Start Correctly) on Windows 10, 8 & 7

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0xc00007b Error Fix Windows 10, 8, 7: Basically, it says ‘The Application Was Unable To Start Correctly 0xc000007b ‘ and comes on Windows 10, 8, and Windows 7 mostly. Let’s check out the reasons behind this error first. Such an error creates a difficult situation for a user while using a computer. It gets irritating, it leaves PC unusable.

How Does The 0xc00007b Error Comes?

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Before going to know how to fix 0xc000007b error, let’s get to know the reason or cause behind this error. Generally, it is seen when a user is trying to run any application or game on their Windows operating system. The error pops-up all of a sudden and demands user to kill their task(s).

The main/root cause is running 64 bit applications/software on the 32-bit operating system or vice-versa. What it does is, when we try to run a 32 bit application on 64 bit OS, it tries to load a 64-bit dll. Most of the times, these errors are seen while playing PC games likes of Watch Dogs, OutLast, and Dead Island.

If you are Windows user, then you may have probably come across this type of error. Perhaps, you have arrived here in search of the fix. So, we are here with the guide on 0xc00007b error fix windows 10 64 bit and 0xc00007b error fix windows 7 64 bit as well as for 32 bit systems.

Here, in this article, we have come up with the solution to get rid of error 0xc00007b or 0xc000007b which come in PC games and other applications. The below fixes will help you to fix application error 0xc00007b and fix 0xc000007b error in Windows 7, 8, and 10.

The error is mostly seen in the following games.

  • Assassins Creed IV Black Flag ( AC4BFSP.exe )
  • The Elder Scrolls Skyrim ( SkyrimLauncher.exe )
  • Battlefield 4 ( bf4.exe )
  • Dirt 3 ( dirt3_game.exe )
  • Call of Duty: Ghosts ( iw6mp64_ship.exe )
  • Diablo 3 ( Diablo III.exe )
  • Watch Dogs ( Watch_Dogs.exe )
  • Just Cause 2 Multiplayer ( JcmpLauncher.exe )
  • Child of Light ( ChildofLight.exe )

0xc00007b Error Fix

Following are the methods to fix error code 0xc00007b, 0xc000007b and 0*c00007b unable to start application correctly.

Solution 1: .Net Framework

Many of such cases arise due to .Net framework reasons. So, what you need to do is to re-install the relevant or latest version of .NET framework to your OS. Downloading and installing the .NET Framework will fix 0xc000007b error. After you have installed it, just restart your PC and the effect will take place.

Solution 2: Repair Corrupt System Files

Download and run Reimage Plus to scan and restore corrupt and missing repositories from

Solution 3: Run as Administrator

In some cases, to fix error 0xc000007b, we need to run the application as an administrator. It may require those privileges.

Follow the steps to execute any application as an administrator.

  1. Right click on the application and select Properties.
  2. Click on the Compatibility tab on the properties dialog box.
  3. Select/mark ‘Run This Program As An Administrator’ box and then, click OK.

Solution 4: Re-install The Application

Uninstall the application and re-install it. If doesn’t uninstall easily, do it forcefully. When it is done, restart the PC and try to run the application again.

Solution 5: Updates

Sometimes, the reason behind this problem is the application update. You may need to install the missing drivers or updated drivers. It’s because Microsoft regularly releases patches which block latest discovered security holes. With these patches,

Microsoft also adds malware definitions to its Windows Defender and Security Essentials utilities. Install the latest patches from Microsoft and update the outdated drivers to make your application work once again.

Solution 6: Run CHKDSK At Reboot

It is recommended to run it once in a while. It keeps PC in good shape. To do it, follow the steps.

  • Click on the start menu and type ‘cmd’, then right click on it and select run as administrator.
  • In the command prompt, type the following command – ‘chkdsk /x /f /r’ and hit enter.
  • Type ‘Y’ when it asks to check the disk on the next reboot.

Solution 7: Install DirectX

Some software and all games require DirectX to be installed for running the same. If it’s a problem, then try download DirectX latest version and install it on your PC. After that try to run that particular software/game which gave the error. You can get the latest version of DirectX from the following URL.

Solution 8: Install and Run VC Redist

  • Download VC Redist Installer and run it.
  • Reboot the computer and test.

Solution 9: Install Microsoft Visual C++

It may be possible that the error occurred due to unavailability or outdated version of Microsoft Visual C++. Or it may be possible that it’s not configured correctly.

Following are the urls to download Microsoft Visual C++ 32 bit and 64 bit.

  • 32bit Windows

  • 64bit Windows

Solution 10: Automatic

It may be entirely possible that the error has occurred due to registry corruption. So, to repair or fix the corrupted registry, you can use Windows Registry Repair Tool.

This particular tool has been designed to solve similar types of corruption and fix the registry of computers. After fixing, the PC will perform faster and better.

Stay tuned to Windows Error Fix for more fixes to errors.