Howdy Ron - welcome to TechIMO!!
Let me get this right - this system is part of a LAN and is the only one that doesn't work? Or is it a standalone, not part of a LAN?
And it works on your home lAN perfectly with change of gateway?
Sounds like a screwy gateway / dns setup. Try a ipconfig /all, and see what DNS servers it gives. If you need to change them in the network setup, then flush them with ipconfig /flushdns.
See if that helps. Must be a simple gateway prob if it works on a diff network. Does it resolve domains? Like ping
www.techimo.com?
Anyhow, if I can't help, we have network gurus here who know everything!!
Cheers
Mick