Error Code 643

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Recently, many people ask me this sort of issue:
I cannot install update "Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update (KB951847) x64". Windows Update encounters a reportedly unknown error code 643 and the update fails.
How can I fix this?

As an expert, let me show you how:
The most common Windows-based problems can be fixed using the SmartPC Fixer. You could also try using different methods of installing the .NET Framework updates, such as downloading the update directly from the Windows Update website rather than letting Windows download it in the background. At last, Microsoft provides a .NET Framework tool that removes a large number of files. Download the tool and follow the on-screen prompts to remove the program. Reboot and reinstall the updates.This is the way to fix error code 643.


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