I had this issue a lot too. Your windows is probably F-ed up, reformat and your set, other then that, I can't think of much to do.

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P4 Northwood 2.8Ghz 800Mhz FSB, i875P, 1.5gb DDR400, Radeon 9800(R350)
Aquamark3 Score: 47,825
Steam, Xfire: Sepht
You need at least 1 server (you know, the black ones) -Cowgoboom
Sepht do you take pride in making others Feel... How should i say this... Retarded? -Silent Archer