Hi" GuYs MeRa Aik Problem Hai Plz Soulation Chy Is Problem Ki

hmm... i need help guys... i was playing this game warcraft or what they call dota.. then during the game, my pc suddenly minimized and went to my desktop.. then i resumed to my game.. then while playing for a few minutes, it minimized again all by itself.. this kept on happening during i was playing.. i dunno whats the cause but it was reformated two days before it happend..

to people who know the possible solution to this problem, kindly share it to me because im really bothered by this problem.. thanks to people who can help me in advance..
thanks
from
DuMMaR