Re: AVG free Anti-virus
I personally prefer Avast!, but AVG is fine. No need to pay for an AV. Just stick with the freebies like Avast, AVG etc
Just keep it updated, but just because you have an anti virus doesn't mean your %100 protected from a virus. But it minimizes the chances and helps you A LOT.
EDIT: McAfee is also good, I've tried Norton, I use to pay for it, had it for 2 years and it wasn't worth it, terrible IMO.