I've used Ad-aware for years. Worked great. I also use Webroot's Window Washer, which also works great. Webroot's Spy Sweeper received a lot of great reviews. Which do you like between the two? So far, Spy Sweeper has yet to find anything on my PC. I've had this computer for a few weeks now. I run it every other day. Ad-aware always found something. I dowloaded ad-aware the other day but it won't finish running. I think it's because of Spy Sweeper. I figured I would try both but apparently you can't run ad-aware while spy sweeper is on your PC.