If you go to Amazon and do a search for antivirus, you'll see a comprehensive list, but you should check with your Internet Service Provider to see if they provide a free one. I'm using the Norton Security Suite that I get free from Comcast, and I'm pretty sure other ISPs have similar deals. Norton and McAfee are probably the most popular ones, but there're numerous others, as you'll see if you do that search. There's no one "best", and no one's perfect, so it's more a matter of personal preference and price than anything else. I've used the free AVG for years and been happy with it until I switched to the Comcast supplied suite about 18 months ago.
I just recovered from a malware and trojan virus which corrupted my user acct.. I've spent the last 3 days with Microsoft C.S. reps.. We did a complete restore and clean up. There went $149.00 but I was desperate.
I am without any security right now and I've been searching download.com for the best all in one antivirus, spam, malware and firewall program.
I do mostly messaging from I.E. 9.0. also, banking, selling, and facebook. I learned I have no "security processor loader driver" while i was in safe mode doing troubleshooting.
Any helpful suggestions for a security (suite) for my activites, would be greatly appreciated..