vista problem

have been playing age of empires III since it came out, we play at home on our lan (3 pcs). i recently upgraded the oldest to pc. new pc has amd athlon 64 x2 4000+ processor, 1.5gb ram, vista home basic... now im having a prob.... minutes into a lan game, new pc locks up then goes to blue screen showing "Kernel_Data_Inpage_Error" below is the details given after reboot...please help !!!!! never had this prob on old xp machine, also doesnt seem to happen on single player games (but havent played many)