## include directories in VS

I am trying to include library paths in VS 2012 through the new property pages.I downloaded and installed mpich2-64 bit libraries under "C:\Program Files\MPICH2\include" and set the include path in Microsoft.cpp.x64.user property file so the path now looks like
Code:
"\$(VCInstallDir)include;\$(VCInstallDir)atlmfc\include;\$(WindowsSDK_IncludePath);C:\Program Files\MPICH2\include;"
But somehow it fails to find the files.
Code:
fatal error C1083: Cannot open include file: 'mpi.h': No such file or directory
The file is definitely there, so what could be the problem ?