I have absolutely no idea. My dad took care of everything since it's the "family computer," and without looking around a bit I really couldn't tell you. But we must have one; we haven't had a single problem with the computer, let alone viruses.
In that case, it wasn't for free.
Actually, every Windows PC you're buying, you pay for a (bulk) Windows license without you knowing that, and I'm sure you've done that for Norton too.
I mean, go to a typical PC shop, ask them for a custom build PC, and they'll give you a specific price.
Now ask to remove Windows 7 from the list, and you'll get the PC 100 Euro's cheaper.
This happened to me at 3 out of 3 shops I've visited.
Don't expect that to happen in a normal shop like Media Markt, they said "we can't, sorry", and that mainly happens with all HP, Siemens, Acer, Asus, Samsung, Dell, Toshiba, whatever PC's.