I've been running my PC fpr the last year without any anti-virus software and with no active firewalls, never had any problems or issues.

No one else uses my pc so i'm pretty certain that viruses won't be an issue.

Maybe i'll just use AVG free edition like I used to, never had any problems with that.

I only mention it really in regards to my other post about my driver issues, wondered if i'd inadvertantly affected my system while updating drivers etc, i've heard of some nasty .dll viruses and when I got random .dll errors I began to worry