[jumpy]

Norton.... urk!

I used the bundled norton AV when I first got a computer. It worked fine for a year or so. But when it came to the endless updates that would just hang and then crash the machine and also its habit of treating my cpu like its own unlimited resource provider....
Since then I've used AVG, NOD32 (was great) but now I'm a cheapskate using Avast (free) which seems to do a good job.

At work I've had the misfortune to experience Mcaffe and Panda. Panda was clunky and used to take about 10 hours to scan (automatic set by the IT department) so I couldn't do any work whilst it was running because AutoCAD needed more resources than the scan would allow.
All of the 'business AV solutions' seemed to be somewhat difficult to use and proved more of an inconvenience than they were worth.

But saying that, one company I worked at for several years had no antivirus protection at all. When I started there, the 'hand-me-down' computer was slower than it should have been. So I DL avg, spybot and adaware. Almost a day later of scanning and the lot of 'em removed thousands of nasty things that a previous user had acquired. From 'helpful browser toolbars' to worms and trojans and general malware, it was all there. I was quite nonplussed to learn of such a lax attitude to that stuff; it was a reasonably big company too.

Gotta say that it's a bit of a faux-pas to release an update that kills everyone's computer though. Companies like microsoft and Mcaffe should know better really... I refused to install XP SP2 for almost 18 months at work because of the trouble it caused upon its initial release.