Please answer this question

What AntiVirus Software Product do you use?

It has recently been made clear to me, at some cost, that I need to upgrade my virus protection. The following are, supposedly, some of the top programs out there; I thought I'd ask you, my vast reading audience, which if any you use and what your experience is.

BitDefender Antivirus

Kaspersky Anti-Virus

Webroot Antivirus

G DATA AntiVirus

ESET Nod32

ParetoLogic Anti-Virus PLUS

Vipre Antivirus + Antispyware

F-Secure Anti-Virus

Trend Micro