I did some tests with .NET-Framework 4.5 on my computer. After uninstalling it, i recognized, my Visual Studio 2010 does not start any more. It shown an "Unkonwn error" message box at startup an then closes again.
How-I-fixed-it:
I found out, that uninstalling .NET 4.5 also uninstall .NET Framework 4. I re-installed .NET 4 from http://www.microsoft.com/de-de/download/details.aspx?id=17718 and Visual Studio was working fine.
I found the right hints here:
http://chanmingman.wordpress.com/2012/05/10/unknown-error-to-prevent-vs-2010-from-start-after-uninstall-vs-11-beta/
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