Did you try defragmenting? Make sure there aren't any nasty spyware/adware/viruses on your PC too by using an anti-virus and anti-spyware. Programs like Avast anti-virus and Ad-Aware have worked well for me, and are both free.
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||DFI UT P35||Q9550@3400 Mhz||Geil 4GB RAM||Radeon 5770||