Not Free. (But it is, coughtorrentcough)
Vista Compatible.
Its not norton.
Symantec Makes norton for the Home user. However, symantec also has a product called Symantec Corporate, it is a Anti Virus program for Large corporations. It is much better Than Norton and highly configurable. I use it myself and I can say having both used Norton in the past and Symantec corporate now. That its faster and much nicer.
(And is the best Payed (Coughtorrentcough) AV along with NOD32)