The “Unknown Hard” error that keeps on appearing in Windows 10 can put users in an unpleasant situation. This kind of error leads to the freezing of the taskbar, blackening of the screen, and sudden disappearance of the icons on the Desktop. And each time you try to open Windows, the system will only give you an error message saying that it’s a critical error and some applications like Start and Cortana won’t work.
Upon analysis, it seems that the “sihost.exe” is not responding and that it is the one that’s causing the c000021a Unknown Hard error to pop up. Sihost.exe files represent the Shell Infrastructure Host which is an essential component in the Windows operating system. The Windows Shell Infrastructure Host is primarily responsible for handling some graphical elements of the operating system interface such as the Start menu and the taskbar transparency. And so if the Shell Infrastructure or Sihost.exe has stopped, has been removed, or corrupted, you will most likely have issues with the overall functionality of the Windows operating system and you’ll get the Unknown Hard error
In addition, the ctfmom.exe Unknown Hard error may also occur due to incompatible drivers installed on your PC. Ctfmom is a process that identifies inputs such as handwriting, languages, and many more. It’s the one that controls the functions of background behavior. To resolve this issue, you need to first try to identify which application is the one that’s running the sihost.exe file. And if needed, you need to either update or reinstall or completely uninstall the problematic application.
The SFC Scan or System File Checker, us a built-in utility in Microsoft Windows that can be found in the C:\Windows\System32 folder. This tool allows users to scan and restore any corrupted system files in Windows that might be causing the Unknown Hard error to appear. Before you use this tool, make sure to find out whether the sihost.exe on your computer is a Trojan that you have to remove or if it’s a file that belongs to a trusted Windows application. Once you have that sorted out, follow the steps below.
The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:
You can also try using System Restore. This is one of the ways you can use it to back up your PC. Since restore points are created automatically each week by System Restore, you can use System Restore to restore your computer back to an earlier good point in time.
Putting your PC in a Clean Boot state can help you diagnose and troubleshoot the issues in your system. During this state, you can start the system with a minimum number of drivers and startup programs that will surely help you in isolating the root cause of the Unknown Hard Error.
After putting your PC in a Clean Boot State, try creating a system restore point and see if the problem still occurs. Clean Boot troubleshooting is designed to help you isolate the problem. For you to execute a clean boot troubleshooting, you must do a couple of actions (the steps are given above) and then restart your PC after every action. You might have to disable one third-party app after the other to really isolate the issue. And once you’ve narrowed down the problem, you can either disable the third-party app that’s causing the problem or remove it. Note that you must switch your PC back into the Normal Startup mode after you’re done troubleshooting the problem. Here’s how you can do it:
AnytimeAstrology is a browser extension for Google Chrome developed by Mindspark Inc. When installed, this extension will change your default new tab page to a custom search provider called MyWay (search.myway.com).
While browsing the internet with this extension installed, you will see additional ads through your browsing sessions, including but not limited to Sponsored Content, Injected Ads and Pop-up Ads.
While AnytimeAstrology is active it will monitor your browsing habits, recording website visits, clicked links, viewed products, etc. This information is later sent back to Mindspark Ad network servers where it is used to better target additional injected ads into your web pages.
Several anti-virus applications have marked this extension as a Browser Hijacker and it is recommended to remove it from your computer.
Error Code 0x80070643 or Windows Update error code affects various versions of the Windows operating system, including Windows 10. Error code 0x80070643 usually occurs due to corruption within the .Net Framework. When this occurs, users will be unable to install updates they have downloaded on their PC.
Error codes within Windows occur for many reasons including corrupt system files, viruses, and lack of space on your PC. In terms of error code 0x80070643 in Windows 10, the cause usually relates to a problem with the .NET framework or errors within one’s registry.
To solve error code 0x80070643 in Windows 10, users will need to employ various manual repair methods. These methods seek to fix core problems that result in the error being present on your device in the first place. Thus, the methods include the use of the .Net Framework Repair tool, resetting Windows Update components, or running a clean boot.
Note that the instructions provided in this article must be followed correctly, as making changes to your computer via these manual repair methods can result in serious problems if mistakes are made. Consider a Windows repair technician if you are unable to complete the steps mentioned in the manual repair methods below. Note, failure to rectify this error might result in other error messages, such as error code 0xc004fc03
As error code 0x80070643 may be triggered by issues related to the .Net Framework on your machine, it’s important that you download the .Net Framework Repair tool. This tool, as the name suggests, helps to repair errors it detects within the setup or updates associated with the framework.
The tool is available on the official Windows site. Download the tool and follow the instructions provided. Once you’ve downloaded the .Net Framework Repair tool, run it and wait until it fixes all problems detected within the framework.
Afterward, reboot your computer and check to see if Windows Update is functioning properly. If the error code reoccurs, proceed to another solution by implementing the second manual repair method listed in this article.
This method is the most technical of all the methods mentioned in this article. It will require that Windows 10 user access Command Prompt and make modifications to the Windows registry – an area of the operating system which stores important information, settings and other details regarding hardware and programs installed on your machine. Follow the steps carefully and be sure to back up the registry before proceeding with this manual repair method.
Step one: Type Command Prompt in the search box near Start, then select Command Prompt (Admin).
Step two: Select Yes as soon as the User Account Control box appears.
Step three: Stop Windows Update service, the BITS service, and Cryptographic service by typing the following commands:
net stop bits
net stop wuauserv
net stop appidsvc
net stop cryptsvc
Step four: Be sure to press Enter after typing each command.
Step five: Type the following command, then Enter to delete qmgr*.dat files:
Del "%ALLUSERSPROFILE%Application DataMicrosoftNetworkDownloaderqmgr*.dat"
Step six: Press enter after typing the following command:
cd /d %windir%system32
Step seven: Reregister the files for BITS and Windows Update that you stopped in step three. To do this, type the following commands, selecting Enter after each command:
regsvr32.exe atl.dll
regsvr32.exe urlmon.dll
regsvr32.exe mshtml.dll
regsvr32.exe shdocvw.dll
regsvr32.exe browseui.dll
regsvr32.exe jscript.dll
regsvr32.exe vbscript.dll
regsvr32.exe scrrun.dll
regsvr32.exe msxml.dll
regsvr32.exe msxml3.dll
regsvr32.exe msxml6.dll
regsvr32.exe actxprxy.dll
regsvr32.exe softpub.dll
regsvr32.exe wintrust.dll
regsvr32.exe dssenh.dll
regsvr32.exe rsaenh.dll
regsvr32.exe gpkcsp.dll
regsvr32.exe sccbase.dll
regsvr32.exe slbcsp.dll
regsvr32.exe cryptdlg.dll
regsvr32.exe oleaut32.dll
regsvr32.exe ole32.dll
regsvr32.exe shell32.dll
regsvr32.exe initpki.dll
regsvr32.exe wuapi.dll
regsvr32.exe wuaueng.dll
regsvr32.exe wuaueng1.dll
regsvr32.exe wucltui.dll
regsvr32.exe wups.dll
regsvr32.exe wups2.dll
regsvr32.exe wuweb.dll
regsvr32.exe qmgr.dll
regsvr32.exe qmgrprxy.dll
regsvr32.exe wucltux.dll
regsvr32.exe muweb.dll
regsvr32.exe wuwebv.dll
Step eight: Reset Winsock in Command Prompt by typing the following command, then selecting Enter:
netsh winsock reset
Step nine: Configure proxy settings in Windows 10 with the following command, then press Enter:
netsh winhttp reset proxy
Step ten: To restart the BITS, Windows Update, and Cryptographic service, type the following commands, then press Enter:
net start bits
net start wuauserv
net start appidsvc
net start cryptsvc
Step eleven: Install the latest Windows Update Agent.
Step twelve: Restart your machine.
Once you’ve restarted your PC, check Windows Update to verify if the error code is resolved. You should now be able to access the latest updates on your device. However, if a problem has arisen and the error code reoccurs, you will need to proceed with a Clean Boot.
If you wish to always have at your disposal a utility tool to fix these Windows 8 and other related issues when they do arise, download and install a powerful automated tool.
net stop wuauserv net start cryptSvc net start bits net start msiserver
net start wuauserv net start cryptSvc net start bits net start msiserver
Error code 0x80070652 occurs when Windows users attempt to upgrade their operating system while another program is in the process of being downloaded. It may also occur due to problems related to previously failed update attempts within Window Update. When this Windows 10 upgrade occurs, Windows users fail to access the version of Windows they are attempting to download. Instead, a message box occurs stating that error code 0x80070652 has occurred on the device. If this error message is not rectified, it could give birth to other Windows 10 errors such as error code 0x80072EE2.
Error code 0x80070652 may result from Windows 10 users attempting to download another program while upgrading their operating system. It may also be caused by an issue related to previous installations of updates. For instance, in some cases, your previous installation of the Windows process may have been interrupted or it was simply not completed properly. This causes any other upgrade process that follows to result in error code 0x80070652.
But what can be done in such a situation to resolve the error code? Windows users have several options available. For instance, they can wait on any additional program that may be in the process of downloading to complete the process before attempting to upgrade Windows. They may also troubleshoot problems related to any failed updates or select a system restore point in which the error code was not present.
The manual repair methods Windows 10 users choose may involve any of the solutions mentioned previously. The choice is largely dependent on the user and his determination to fix the error code. However, note that automated tools or Windows repair technicians may also provide solutions to PC issues like error code 0x80070652.
Since previously failed updates within Windows Update can lead to the occurrence of error code 0x80070652, Windows 10 users will need to verify which of these failed updates occurred by checking the history section of the Windows Update tool. Once you’ve been able to verify that failed updates have occurred in the recent past, you’ll need to troubleshoot these problems to rectify the error code. Follow the instructions below to check for updates that have failed to install properly via Windows Update.
Once you’ve completed the troubleshooting of any updates which failed, proceed by rebooting your device. You may then reattempt to upgrade to the latest version of Windows 10 once no other program is in the process of being downloaded.
If the problem causing error code 0x80070652 was related to failed updates of the past, these issues will likely be resolved once you successfully troubleshoot them. However, if the error code reoccurs, apply the next manual repair solution mentioned in this article.
Another option available to users is simply downloading updates manually by visiting the official Microsoft website, specifically the Windows section which provides downloads. To successfully complete this process, ensure you look for stand-alone packages of these downloads available on the website. You will need to know the Microsoft Knowledge Base (KB) article number related to the specific update(s) which failed.
Once a Windows user has verified the KB article number of the specific update, download it from the Microsoft website, then select Run to install the update. Reboot your PC, then check Windows Update to see if you are able to successfully complete the Windows 10 upgrade.
If the upgrade fails, you may need to implement the next manual repair method as is mentioned below.
One of the best options for Windows 10 users facing certain PC problems is to apply System Restore. This allows them to reset their machine for a period of time in which the problem was not present. This is known as the restore point. To apply this manual repair method, follow the steps below.
If you wish to always have at your disposal a utility tool to fix these Windows 10 and other related issues when they do arise, download and install a powerful automated tool.
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