I formatted my computer a month ago, because it was completely eaten up by viruses and worms. So after i formatted, i got rid of all the partitions and made 1 big partition. Now after installing windows Xp again and all the drivers for sound card, graphic card, motherboard etc etc, i started using the computer as usual. But after installing a game it started giving me problems. I finished installing Fifa 2006, a big game, and the computer seemed to run fine. Then all of a sudden the whole computer turns off as if there was a power cut ( but there wasn't). So i immideatly tried to turn it back on, it would turn on the fans, and after 3 seconds it turned off again, i tried to turn it back on like that 5 or 6 times in a row, same routine fans turn on for three seconds and it turns off again. So i decided to wait for 10 minutes. This time it started up again, but alot slower than usual. I turned it off again and left it for about 4 hours. Turned it on again and it worked fine, again i opened fifa 2006 and again the same thing happens, it turns off. It even does that when i played a game (icy tower) that runs on old pentium II, 64 mb ram computers!!! I did not overclock my computer if that is in anyway important. And this only started happening after formatting the computer and changing the partition. Whats going on?? does it have to do with the single partition (i doubt that thought)? or could it be that something in my computer is overheating??? My computer is Pentium IV, 1gb of ram and 3.0 GHz.