I did some house cleaning on this computer today and also removed PerfectDisk 2008. I got rid of a bunch of stuff. I gained about 1g of space on the hard drive. I started this because I got hit with a trojan that Norton blocked. Anyway I would like some of you who know a lot about this stuff to give your opinions on what's the best defragger out there or if it is really needed in addition to what Windows has.