I am lagging in Modern Warfare 2 usually when im outside on a map. It ran perfectly for about one week then it started to lag. My computer is not a month old. Ive tried reinstalling my driver and it runs fine until i restart my computer. The only driver i have updated is my video card driver.
Windows 7 64 Bit 4 GB Ram GTX 260 - 195.62 driver Intel Core 2 Duo E84000 500 GB Hard Drive
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How about you PSU? Do you know the brand name and how many watts and amps it pumps? I've got the HD4870, which is sort of the equivalent of your card, and I'm running it flawlessly.