Check your network stack (Start/Settings/Control Panel/Network). If you're running on a LAN, it should probably look something like:
Client for Microsoft Networks
Dial-Up Adapter
Intel Pro/100+ Management Adapter
TCP/IP -> Dial-Up Adapter
TCP/IP -> Intel Pro/100+ Management Adapter
Probably you've lost everything, & you'll need to re-install it.
Viper GTS