Download the dotnetfx_cleanup_tool.zip from Microsoft
by ihfwt - 9/3/10 7:17 PM
In Reply to: Windows wants to reinstall updates that have been installed already by Lee Koo (ADMIN)
Run the dotnetfx cleanup tool, then reinstall dotnet. I've used this tool before and it works.
Read more @ http://blogs.msdn.com/b/astebner/archive/2006/05/30/611355.aspx

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