You can also use canned air to clean the inside of your computer out, to get rid of the dust bunnies hiding inside. I use an air compressor and stand about 2 feet away, then let it air out just in case any moisture was in the air tank. We use a program to clean up the bad folders, files, spy ware. It also cleans the registry and finds empty and duplicate folders/ files to delete. The program is called Glary Utilities PRO, we got it free through giveaway of the day.