Are you using a vb script and group policy to map your network drives in Windows 7? Are those drives actually mapping? Mine certainly were not. I stumbled across this post at windows connected, and low and behold, it works.
Browse through the registry of the Windows 7 machine (regedit) and add a new DWORD called EnableLinkedConnections. Set the value to 1. Like so….
EnableLinkedConnections = 1 (DWord)
Now log out and back in again, and you should have your drives.