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Cannot reinstall .net framework 2.0 service pack 1

I just installed QuickBooks Pro 2008 & it was running well. Today QuickBooks not start and after diagnosing the problems it appears to be related to a corrupt .net framework 2.0 service pack 1. I tried to uninstall it and got the error "the source cannot be found". I then used the Windows Cleanup utility to uninstall it. After a reboot I tried to reinstall it and got the error it is already installed (even though it does not show up in Add/Remove Programs.

How can I make sure all traces of .net framework 2.0 service pack 1 are removed from the registry or is there another utility I can us to make sure it is completely remove it. QuickBooks will not run without it. My system is Windows XP Professional SP2 with IE 7.0 & all current Windows updates.

Thanks, Roy
1 Solution
Go under this registry key

and look through the entries until you find the microsoft.net framework once you find it remove the entire key.
See this Microsoft KB article on .NET installation problems:

See the section on manually removing and reinstalling
rbrotherAuthor Commented:
This was a perfect solution (Thank you). The .Net Framework cleanup tool removed all references to the .Net Frameworks and allowed me to reinstall them easily.

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