I d/loaded AVG free edition 7.0; superb!!, it looks for updates daily, & performs scans most days, I have an unused boxed version that cost £26, anybody want it?, £15!.
Since I d/loaded 7.0, I haven't had one virus in almost a year, the virus vault remains empty, I run it in conjunction with M/Soft firewall, I had 6.0 first, & had several viruses, mostly trojan/dropper, but they were all contained in the virus vault, there is also an excellent support system,
I would not swap my AV for any other.