No internet connection on Vista

Hi, I have a dual-booting pc of XP and Vista. I and plugged into a network with internet. Vista was fine of a while but then for some reason it wont connect to the internet. I tried everything installing drivers resting the modem and network nothing works. But XP part of my computer is fine though its very weird. I don't no what to try next. I trying re installing the network driver but nothing worked. Please Help!!!