HTTP 1.1 500 intrnal server error解决办法

HTTP 1.1 500 intrnal server error解决方法!
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为什么我新建WEB项目时会报"HTTP 1.1 500 intrnal server error"错误??该怎样解决??

------解决方法--------------------
more details? what os? what version of vs.net? try to run

For 1.0:

WINDIR%\Microsoft.Net\Framework\v1.0.3705\aspnet_regiis.exe -i

For 1.1:

%WINDIR%\Microsoft.Net\Framework\v1.1.4322\aspnet_regiis.exe -i