Hi,
I found this on another site. Paste this into your environmental path and see if it works for you :
C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem
This is where I found the above info FYI
http://answers.microsoft.com/en-us/windows/forum/windows_vista-system/default-window-vista-home-premium-environment/403e1162-fec5-4e0b-aead-3de78e58de4a