I have a copy of SYMANTEC AV 10 / and MS Antispyware. It is FREE and not a bootleg copy. I get it from the government (no conspiracy theories plz) for free and they encourage us to give it out for FREE as well. Anyone who wants a copy, I can send it to you on a CD, FTP it to you or whatever. It is for anything up to XP. It will automatically do live updates and keep you current, and you can put it on as many PC's as you can. No limits, and it continues to update as long as you are connected to the INTERNET (cloud).
Also for all you newer MS OS guys then Microsoft Security Essentials is the way to go. It is FREE as well and does an outstanding job as well keeping out the VIRUS woes.
Please keep in mind, when you do unscrupulous things with your computer no amount of cover will keep you from getting a VIRUS, eventually they will get you. These last few programs are for the backyard PC guy who stays away from the bad neighborhoods..
Shoot me a PM if you want the AV-10 or the Spyware stuff.