


Spybot is fantastic at isolating and removing spyware, and Ad-Aware - true to its name - is particularly good at isolating and cleaning away Adware that may be installed on your computer. It's because they are particularly specialized in their own areas. It isn't because I think those two applications can replace other antivirus apps. With that said, whenever I help any of my friends or family that are having computer performance issues that could be related to a virus issue, I always suggest running Spybot in addition to Ad-Aware. I just don't trust free antivirus applications to cover all of the bases - and figure that companies hoping to bring in more customers (and more money) are more motivated to stay on top of the latest threats.

I've run a standard paid antivirus for years, switching from McAfee to Norton, and then finally to Kaspersky. Matt recently reviewed and compared the most popular free antivirus products, and didn't actually rank Ad-Aware Free Antivirus very highly, but called it a "suitable choice" if you can swallow the higher-than-usual CPU consumption.
