Try un-plugging your cable modem for about 2 mins and then plug it back in... if internet speed is the problem.
If not, try to download and run Lavasoft's Ad-aware. It will remove all your spyware junk and should speed it up a bit.
Also, check to see if you need to defrag your hard drive.
Another, make sure your virus definitions are up-to-date and run a virus scan!
Oh, and........
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