Speed up my computer

[compdict]

So I've had this computer for about a year now, and I think it's being bogged down by some malicious programs or stuff. I haven't really cleaned it because I'm not sure what the best programs to remove the stuff are.

I know that Spybot is okay, Adaware is okay, and HiJack This is also good, but what else could I use to clean my system? Like defrag it or something?

Basically I'm looking for any and all suggestions as to how to speed my computer's performance up, as well as clean it.
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[lynnmosher]

You probably need Ccleaner. It's free. Cleans out all the junk your computer collects on the internet. It also clears out what it calls issues, leftover files from uninstallments, etc.

http://www.ccleaner.com/