no network adapters (code 31)

Gateway LTop mx7527 has no network adapters. have uninstalled, rebooted, did not work. tried to load program 802.11 G, form GATEWAY site--- did not work. hard wired -- did not work. no 1394. no lnksys. IE and Firefox will open but can not access the internet because hardware is not found.

This happened all of a sudden, was having problems with a anti-virus program that was the virus. have gotten rid of it. Lost adapters before it was deleted.