[Monkeydad]

I've been using Microsoft Security Essentials (free download) for a couple of years and it's great.


Previously I used AVG Free and Avast but they can occasionally be buggy and I don't like all of the alerts. They used to be much better than they are now.

The MS product just works...and you never have to notice it.

Microsoft Security Essentials - Microsoft Windows


I see absolutely no reason to overpay (annually) for something like Norton or McAfee.