Windows Vista - Update installation failure - Asked By John on 09-Apr-11 10:27 AM

Unable to install update "Microsoft.NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family update" KB951847 X64. Error code 643 comes up. Appreciate your help.
Riley K replied to John on 09-Apr-11 12:31 PM
Try to uninstall the .NET version you have, run the cleanup tool and reinstall.  To manually remove and reinstall the .NET Framework, follow these steps:

 

 

1.   Remove the .NET Framework.

1.   Click Start , and then click Control Panel .

2.   Double-click Add or Remove Programs .

3.   Note each version of the .NET Framework that is already installed on the computer. Then, uninstall all the versions of the .NET Framework.

4.   When you are prompted, restart the computer.

 

 

2.   Use the Windows Installer CleanUp Utility to clean up the MSI database state for all the versions of the .NET Framework.