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it seems to me that you're having a driver-based problem (maybe an "illegal function call" or something). does that happen on every game?

it seems to me that most of the dos days people were favoring x86 in programming, it may cause the fatal crash that you are using an AMD... :blink:

[Sebaot]

I reinstalled my OS (XP) but that did not change the problem a bit... It actually gave me some new ones instead :P ... anyway I tried to deactivate the Geforce card and that seemed to help a bit... I gave me maybe half an hour before the computer froze...
So this i probably some malfunctioning in my hardware?! Maybe a good time to buy a new motherboard?

/Sebaot

[The Fifth Horseman]

Check the CPU temperature often. See if it goes too high too quickly - if it does, then the security circuitry on the motherboard will kick in.

I once had a similar problem... which disappeared all by itself, suddenly, and never came back.

[Eagle of Fire]

Adding a little new fan inside to assure the internal components to stay cool enough may solve your problem too. Sometimes this kind of problem may happen when you "overcharge" the motherboard card loadout. In itself it's not a problem but if the heat is too high then the mini components will begin to grow out of proportion in the cards/board and either break or not work at all. That's why you have a security which kick in (like The Fifth Horseman just said) if the temperature get too high.

[Sebaot]

But why does it get overheated by old computer games? I can have the PC on for hours in plain windows mode...

[Eagle of Fire]

Some old games may need a lot of processing power, but I am wild guessing here that it's mainly because of emulation needs. Windows don't have a "true DOS" at all so somewhere it must be "emulating" it somehow.

When using programs like DOSBox and Nesticle then it's obvious that you require a lot of processing power. Emulation always need a lot of that.