Hey guys, I've tested many anti-virus programs since 1995 & i keep rechecking for the best. IMHO, I prefer to pay for the best anti-virus program out there than to loose my important Documents to a virus. I've tested Norton, McCafee, BitDefender, Kapersky, Avast, AVG, Nod, etc... etc...etc.
Since 2004, I've been using F-Secure & I found its the best that there is, even if you need to pay for it, though it costs less than to clean up a virus corrupted pc. I found its a company that specializes in virus & internet security, even serving many EU governments & worldwide.
Unfortunately, Norton is not a virus company, nor McCafee. They specialize in optimizing pc performance( e.g. star product: SystemWorks). BitDefender & Kapersky have been cracked, so their vulnerable.
The best way to see if your antivirus program is great, first go to PCWorld.com & check their rating. They do Multiple test to antivirus programs to determine who is the best. Second, always do a online scan of your pc. Many of these companies have Online Scanners, where there servers do a virus scan of your pc. I suggest you do many of these from different companies to ensure your pc is safe.
Then also, the best computer is not a pc, its a mac. There is no virus written for Mac OS X & today you can run pc programs on it too, under the Mac protection.
Here are my 2 cents & I hope it can help you all.
Snowsnake