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How to Fix Sihost.exe System Unknown Hard Error

How to Fix Sihost.exe System Unknown Hard Error

Sihost.exe System Unknown Hard Error - We have gone through lots of Windows related issues in the past. Likewise, we will focus on a new Windows related problem occuring on Windows 10. This is about a system error that results in freezing of taskbar or black screen or desktop icons disappearance etc. The actual error shown on the screen is "Unknown Hard Error" with suitable heading "Sihost.exe – System error". The appearance is really unpleasant on situations when we are on work.How to Fix Sihost.exe System Unknown Hard Error

Every time we deal to launch the Windows but system shows the same critical error said above. We suggest you the best troubleshooting for this error. But before proceeding further let have a look "what is Sihost.exe". The Sihost.exe is also abbreviated as Shell infrastructure Host. It is an executable file. It is a core component of Windows environment. SiHost handles several graphical elements of the Windows like Start Menu and taskbar transparency.

Sihost is also responsible for c000021a Unknown Hard Error. So, if it gets stopped/ corrupted/ removed will disrupt the overall functionality of OS. Similar with the case of Ctfmom.exe associated Unknown Hard Error. It occurs due to installation of corrupt drivers on computers. The Cftmom executable file handle handwriting, languages, background behavior.

How to Troubleshoot Fix Sihost.exe System Unknown Hard Error

There are three best & unique troubleshooting methods to counter such an error. These are SFC checker, System restore and Clean boot troubleshoot.

  • Perform System Restore—

If you are sick of such an error then navigate to the already saved system restore points. Maintaining the previous store point will fix the issue. This is a type of backup of system. So, navigate to system restore window and select one of them. Since restore point is automatically created every week by System Restore tool.

Go to Search bar, type "System Restore" & press Enter. As a result, create a restore point option will generate. Click on it "Create a restore point". You can get it through Control Panel also. Now switch to System protection tab. Click on System Restore button. A window will open with two option. Either go for Recommended restore or choose custom one. Select the one and follow the wizard till completion.

  • SFC (System File Checker) -

This is located on path C:\Windows\System32 folder. It allows us to scan the entire Windows to check for corrupt files. We need to run sfc/ scannow command on Run. Go to search bar, type run and press enter. When run command window is open. Type cmd. Type sfc/ scannow & press Enter. It will take few minutes to scan. If any corruption are found it will automatically fix during reboot.

  • Troubleshoot in Clean boot mode

Sometimes a third-party app might block the System Restore execution. So, we need to find out the application which is blocking the System Restore procedure. For this, we have to Start PC in Clean Boot Mode. Open system with administrative privilege. Press Win+R to open Run Command Window. Type msconfig.exe & press enter to open System Configuration Window.

Go to General Tab and select Selective Startup. Uncheck the "Load startup items" option and Click on Apply & then OK. Navigate to Services Tab and select "Hide all Microsoft Services" option available on left side of System Configuration Window. Then click on Disable All button. Finally Restart the PC.

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