Alt+tab, minimizing game problem

[mser123]

Whenever I ALT+TAB or minimize my game multiple times (over 10 perhaps), to look at the walkthrough of Black Plague, for example, my computer reboots all of a sudden. It only happens after alt-tabbing several times, and it only happens in Black Plague. A blue screen about BIOS flashes and the computer restarts.

Could there be a fix for this? Is it because I'm playing on 1680x1050 resolution? Anyone else experienced the problem?

Other than that, I love Frictional games, such great psychological/horrors, I just love them. I especially loved Penumbra: Overture, but Black Plague has such an interesting way of scaring you and creeping you out at the same time. Some facts in the game, actually make me think about them in reality.
Keep making such great games, they're certainly special, and I'll support you as much as I can.

Thanks.