Games going in Fast Forward??

[FIESTARIA]

hey there!I am facing a weird problem with my pc and I really need yout help guys.(sorry for my english, I am greek).
Everything is going so fast! I suppose now you are wondering...is this a problem?? Yes it is when you are in a gaming mode...
to be more specific. Initially the gameplay is normal but after half hour gaming, it strangely becomes 2-3 times faster and it very annoying. The game becomes totally unplayble and this is fixed with a restart. I had this problem with Mcrae 2005 but I didn't pay attention because I thought that it was a bug or something.I came across with this problem for one more time while playing prince of persia two thrones. I finished the game and I've made a fresh windows installation, new drivers for everything and so on. I am currently playing paikiller batlle out of hell and guess what...the same problem again! On the other hand, i didn't have such problems while playing tomb raider legend!I really do not know what to think. anyone with the same problem?
thanks in advance!!

 

[rstrohkirch]

load up the game
alt tab out
use taskmanger to set only 1 core to the game
see if problem is fixed

 

[FIESTARIA]

I set affinity to 1, played for couple of hours, everything worked great!strange though because everything worked fine in painkiller but not in the expansion. anyway i am glad i can play the game!Thanks rstrohkirch!!