I haven't used one of my computers for one and a half of year. I remember it was filled with viruses. So I dusted my six-year-old computer off today and I set about repairing it. Malwarebytes Anti-Malware and RogueKiller removed most of trojans and rootkits. But one thing still persist: computer can suddenly crash. Before cleaning, it even coudn't stand 10 minutes. Now the deadline of its work is about 1,5 hour after turning on. So it looks it overheats quickly, yeach? But: PSU is new.It's not hot inside/outside.The computer was cleaned inside (no dust).I take special malware into my consideration. Maybe the one concerning boot sector? OS:Windows XP