What causes the Windows Update Error Code 643?
The appearance of error code 643 refers to the update not being installed on the system due to some reasons. These are usually are: There are many things you can do to get rid of this error. As we mentioned earlier, the error can be caused due to multiple reasons and the solutions vary as well then from one particular scenario to another. Anyway, you can try these solutions mentioned below. Hopefully, one or the other will work for you depending upon the cause of your problem.
Solution 1: Run Windows Update Troubleshooter
As this error restricts your Windows from updating so the first thing you can do is to download and run the Windows update troubleshooter to see if it can resolve the issue or tell you what steps you can take. To do that in Windows 7, 8 and 8.1, you have to download it first.
Solution 2: Remove and Reinstall Microsoft .NET Framework:
One of the things that can be causing this error is a corrupted Microsoft .NET Framework installation. The remedy is to uninstall or remove Microsoft .NET Framework completely and then reinstall it. To do that, you need to download the .NET Framework Clean up tool to uninstall all the .NET framework components and then reinstall it.
Solution 3: Turn off your Third-Party Antivirus
Many times, some features of the antivirus software can block Windows update from functioning correctly. If you are getting this error and not being able to update, you can try disabling your Antivirus software and give a go at Windows updating again. If it has been caused due to antivirus software blocking it, then it will run properly after you disable your antivirus software.
Solution 4: Repair Microsoft.Net Framework Client Profile:
A corrupted Microsoft Framework Client Profile can also, sometimes, result in the appearance of this error. The good thing is that Windows 7 users can repair the .NET Client Profile using the control panel. To do that,
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