GW reboots my comp

hi.i got a problem when i play GW it works fine but when i got to the portal that goes to drakkan lake w/e its called in Eye of the North my screen turns white and blue and reboots my comp.i dunno wat the problem is cuz i have GW:Factions and that stuff never happend to me when that happend. It wasent the Blue screen of death either it just went blue and white.i dunno what to do now.plz help me.thanks u

P.S:The Eye of the North i got was a trial so i dont know if that was a factor,also the game works fine everywhere else but when i get there and it finish load it just restarts.

You probably have an underpowered gfx card.

i fixed the problem i just had to update my drivers lol XD