visual studio 2010 - Asp.net 4.0 has not been registered -

when try open visual studio project following error:

asp.net has not been registered on webserver need manually configure webserver asp.net 4.0.

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update:
nevermind fixed it:

i repaired .net framework 4.0 , issue resolved.

i fixed issue running

aspnet_regiis -i

using visual studio command line tools administrator