lol, i usually do that too, as a matter of fact this installation of win7 i've yet to put an anti virus on it. It's runs smoother without one and if or when I do get a virus i can just reinstall it, or some use backups but eh, fortunately I have an external hardrive which I store most everything on so nothing the viruses can do to me really. The main thing you can do to keep your computer clean and running smoothly is don't download from untrusted sites, check the links people, and when you are installing always choose the advanced option and uncheck any toolbars or homepages and decline any offers they might want to throw your way. Also go into google settings or what ever browser you're using and find the option where you choose where to download files everytime, that stops webpages from automatically downloading suspicious files.