Pardon my ignorance, but I was searching for some free computer security.... I found, and read about Avast! at download.com. So I downloaded it and installed it and am currently running it. My question - it appears to only be free for 30-days, but from things that I've read it sounds like there is a free version that isn't time limited. Am I mistaken, or how could I track that one down - if it exists?