.net framework is not installed [closed]

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I have installed .net framework on my PC but many applications are not running says .net framework not installed yet the required versions is installed

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Check HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP key and c:\WINDOWS\Microsoft.NET\Framework\ to be sure that specific versions really installed. If you'll not find any you need, then try to re-install.

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I've found http://www.hanselman.com/smallestdotnet/ to be useful in working out which version is installed and what is missing.

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Uninstall it, and reinstall it. That has worked for me in the past. And double-check to make sure you have 3.5 SP1, not just 3.5!

Hope that helps!

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you can try .net framework fix tool at the link below...

http://blogs.msdn.com/b/astebner/archive/2008/08/28/8904493.aspx