http://www.ccleaner.com/Helps getting rid of unwanted crap on your computer, ie. temporary files, auto unneeded downloads, unintall info that cloges up over time, remains of past virus's that takes up a good amount of space and slows your computer slightly, etc. Requires a setting when you download to see what you want to destroy. When I first downloaded it I freed up 7 gb of space. It also destroys that hideous zootube layout. It's a free download.