Why can I only run games in windowed mode?

  • Thread starter Thread starter Henkkasd
  • Start date Start date
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Henkkasd

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So here's the deal;
When I bought this computer, it ran games like a charm. But for a little while now, it has stopped to run games normally, I have to run almost every game in a windowed mode. (CoD4 and Lord of the rings online work without windowed mode).

How could I fix this?

Specs:
Vista Home Premium 64-bit
Ati Radeon HD 3650 with 512 mb of video memory
4 gb (2x2) of DDR2
AMD Phenom x3 8550 2,2 gHz (together clocked 5,63 gHz)
A 300 W PSU

Can't recall what my motherboard is... but I am going to need a new PSU. Any ideas how to fix this?
 
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