Yeah, I had the same problem in Windows Server 2003 where the Netgear FA311 card wasn't installed by Windows Setup, and psshutdown failed to function. EDIT: Just got an email from SysInternals, and they say that a NIC is required for PsShutdown to function. If you don't have a NIC, or are unable to get the drivers installed during Windows Setup, then you're out of luck I'm afraid :/