Not yet, no. It's a new laptop, untouched. I won't do anything until the protection is installed. I don't want to bring my whole company down, whilst looking for dodgy warez, or something.
Okay.
FWIW, we have the Norton corporate edition here at work, and, yes, it is pretty low profile, but I suspect that a lot of crap gets caught way upstream from my desk; I work for a U.S. government agency, and you have to assume that a lot of hackers would consider Uncle Sam to be the juiciest target for attack.
I mentioned I run AVG and AntiVir at home. They both appear to be stable and reliable, and I've been using them for about two years (I had Avast! for a while but didn't care for its interface and the free version seemed to me to be rather limited in flexibility, so I dumped it). I have both apps set to do auto sig file updates every night (a minute or so each), followed by complete system scans every night (an hour or two each). In the last two years, they've detected maybe two viruses and promptly dispatched both of them.
ZoneAlarm is a firewall; I like it better than Windows's firewall, though it is a bit intrusive, and doesn't recognize when you've installed an upgrade/update to a program, so when a new version of AVG or AntiVir gets loaded (or Firefox), it asks if I want to allow them to contact the internet. Note, that doesn't interfere with virus sig file updates.
Prevx is an anti-intrusion app. The most important thing it appears to do is intercept any attempt to write to your system files, directories, or registry, and ask if it's okay. his means any new program installation (or again, upgrade/update) gets interrupted. If you're installing a program and therefore need to allow writes to the system area, you can temporarily suspend Prevx, or alternatively, allow the write and have Prevx remember your answer for future installations of the same software.
Spybot S&D catches spyware. I've found it very effective; its resident program works very unobtrusively.
IMHO, everyone should have these or similar products installed on their machines. No, I do not have any financial interest in any of them.