NuGet fails to load PowerShell
The only solution that worked was to start the PowerShell manually before starting VS2010.
So if anybody had this problem that's the quick fix.
NuGet needs Powershell2 to work correctly. You can download and install if from here: http://support.microsoft.com/kb/968929
Starting the powershell doesn't help me. I found that this is an known issue of Nuget. You get this issue because you have red gate reflector add-in installed and enabled. If you update Reflector to the latest version (>= 6.5), it should work.
Please take a look at this link