Powershell Community Extensions on Vista x64
From Birnam Designs Wiki
Installing PSCX on 64 bit Windows doesn't fully work -- it works if you run PowerShell in 32bit, but not 64bit version. A workaround is to re-register the dll with the 64 bit version of installutil:
set-alias installutil $env:windir\Microsoft.NET\Framework64\v2.0.50727\installutil installutil "$env:pscxhome\pscx.dll" add-pssnapin pscx
