could always give your system a good cleanup.

download and install spbot s&d from safer networking. update it, run it, remove any dodgy crap on your pc

do a disk cleanup

do a disk defrag

run msconfig and check whats in the startup, you can untick things you dont want starting with your pc (be VERY careful with this)

That should help a lot, possibly run a virus scan as well. any questions drop me a pm or msn and ill be glad to help you mate.