I dont quite believe this, but havent tried this either.
Free 1 year subscription of McAfree Virus Scan Plus
I have heard about free trial licenses from such companies for a month or two or three, but never for 12 months.
I just tried to register following the link, and it does seem to work. I didnt actually download the software yet, but I would sure do that. Sometime over the weekend.
It sounds really really amazing to me. A 12 month free subscription.. great... :)