Hi, I am using core2duo processor 2.93Ghz, 2GB RAM, Windows 7 Ultimate OS. My problem is that whenever i open multiple youtube video screens, the PC restarts, whether i use IE or Chrome browser. But the same don't happen when i use PC for other purposes or when i browse other websites(multiple at the same time) or while downloading any videos. So i don't think the problem relates to any overheating of hardware as it happens only in youtube cases. Kindly help to solve the problem.