Solution 1: error 643 Windows Update by Fix-It fix
The error 643 or 0x643 indicates that the MSI software update registration or the .NET Framework-Installation error. The Problem occurs especially then, if you have a Update for the Microsoft .NET Framework download want. With a Fix-It for Windows 7, you can get the Problem under control quickly. Users of Windows 8 and 10 you have to approach differently, as we show in the next section.
- Download the free Fix-It from Microsoft , download and run the file from.
- Check the box next to "agree" to accept the license terms.
- Then click on "Continue" and confirm the security query on the user account control with "Yes".
- After the repair process is complete, you can close the Tool again. Then, start Windows Update again.
Windows: error 643 fix
Windows Update repair
Solution 3: .NET Framework reinstall and fix Windows Update error
The error still occurs, you can .NET Framework completely uninstall and re-set up. For this purpose, Microsoft provides a special Tool:
- Download the ".NET Framework Setup Cleanup Utility" download. Unzip the archive to any directory and start the file "cleanup_tool.exe".
- Click "Yes" to confirm the Start of the program. Then, you confirm the license terms.
- Select in the drop-down list at "Product to cleanup" on the entry ".NET Framework - All Versions" from. Then click on "Cleanup Now".
- Wait until the process is complete and you restart your computer afterwards.
- Download now ".NET Framework 1.1" to download and install it.
- Then download the ".NET Framework 1.1 Service Pack" downloaded and start the Installation.
- Finally, install the ".NET Framework 3.5 Service Pack 1" on your computer.
- Restart your PC and then run Windows Update again.
Windows error fixed
What to do when Windows Update no longer works, we will explain in our next practice tip.
