Add this script to your powershell profile.  If you don’t know where your powershell profile is, open a powershell session and type $profile and press <Enter>.  In Windows 7, you can run powershell from the current folder by typing powershell in the address bar of windows explorer.

	#Set environment variables for Visual Studio Command Prompt
	$vspath = (get-childitem env:VS100COMNTOOLS).Value
	$vsbatchfile = "vsvars32.bat";
	$vsfullpath = [System.IO.Path]::Combine($vspath, $vsbatchfile);

	#$_ shortcut represents arguments
	pushd $vspath
	cmd /c $vsfullpath + "&set" |
	foreach {
	  if ($_ -match “=”) {
		$v = $_.split(“=”);
		set-item -force -path "ENV:\$($v[0])"  -value "$($v[1])"
	  }
	}
	popd
	write-host "Visual Studio 2010 Command Prompt variables set." -ForegroundColor Red