Originally posted by JimC6
...it installed all kinds of programs like Smileys on my MSN, Toolbars on my IE and stuff.
Those aren't viruses, that is spyware. They don't really hurt your computer, they just slow it down, monitor what you do, steal your personal information... That kind of stuff. And Spybot is used for spyware, so I guess that's why it found them and Avast didn't. I used Spybot in combination with some free antivirus like AVG or Avast! for a long time and haven't had any problems. The money for these antivirus companies is not in selling antiviruses to individuals, but in offering security solutions to companies, so some of them give their products free to individuals. I guess they got tired of trying to protect their sofware from being cracked.
I talk these things out with my friend who works in information security and he told me that these free antiviruses work equally good as some that you have to pay for, if not better. The best free thing, according to him, is Comodo atm. I have been using it since I formatted my HD two months ago and I am pleased. You can download it here: http://www.comodo.com/home/internet-security/free-internet-security.php I don't work for them or anything, it's just that I had problems myself looking for this package, as I could only find free firewall using google. This package, however, contains firewall, antivirus, host-based intrusion detection system and sandboxing. The latter means that whenever it finds some application suspicious, it isolates it. Can get a bit annoying, as it mostly blocks harmless applications(or does it?), so you have to click some to get the application started, but other than that it's fine. When installing, it also asks you if you want to install GeekBuddy, a live support system, which you can safely cross out imo.