Weird Computer Problem

[Winned]

Lately my laptop has been going into a weird sleep mode type state. It basically shuts down randomly, but the laptop is still actually On, with the power button and the charging button still lit up. If I try to hold the power button down it won't turn off, no keys do anything either.

I thought it might have been overheating, as my last laptop had that problem, so I cleaned out the fan, my cooler, and everything else but that hasn't helped. I ran a virus scan and I found a trojan, and I thought that would have stopped the shutting down thing but it didn't.

Anybody face this problem or a similar one before? Any ideas of what the problem might actually be or how I can fix it?

[Infuritaion]

I was about to say overheating. With my laptop, it gets moody when it gets too hot, and it only gets too hot when its on my lap or on a soft surface. I've found that I need to either use it on a desk or... I've found a perfect sized hard covered book that I put under it. Or get one of those overpriced plastic laptop table things.