minimize program problem

Hi!
I have a serious problem since the day i bought my pc. After using m
computer a while (sometimes instantly on starting windows!!) and tryin
to start any game, the game window minimize itself and all i see is m
desktop. I can see the game on the taskbar and when i click on it; i
tries to restore to full screen but fails and it's my desktop again
When i do the Ctrl+Alt+Delete i can see that the game is stil
_WORKING_;it doesn't give any error. But i can't do the switch (and
tried using Alt+Tab). I thought it could be my graphic card so
downloaded and installed the latest drivers. I bought a new cooler fo
my graphic card too. I checked default(not fail-safe) settings o
BIOS.But i still have the same problem. The only solution is to restar
my pc and it's so irretating.
I have geforce fx 5500 graphic card, p4 3.00GHz processor. Th
temperature in the case is 50-51 C.
How can i fix it? I hope it's not a hardware problem ..

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UFU
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