I had norton secutriy about 3 years ago. (symantic)
Worked no problems on the XP machine and I have seen people running Norton 360 without issue. For all the bitching about it, I have found it is actually no more or less a resource hog than any of the others.
I think peple just get on the bandwagon of bagging it.
I switched to Bit defender anti virus and zone alarm for firewall because of all the negative resource talk......backfired on me there.
Bit defender runs like a piece of sh*t on win XP, both machines that have had XP are NOTICEABLY slower in every way once installed. However on VISTA it runs like a dream strangley (as normally its the other way around), dont even notice its there and the slow down in using things is not existant.
Zonealarm went crap at one stage, dont recall now exactly what put me off it but it had to go. I use COMODO firewall and it is truely excellent and have had no issues at all on the XP machine. VISTA is running vista fireall control, thinking of swapping to COMODO (COMODO wasnt out for VISTA when I got VISTA machine).
Coincedently my bit defender subscription is up in 13 days.......time to think of what to do, have though about Kaspersky, it gets great reviews but there is a known compatibility problem with some software or hardware I use (read about it 6 months ago but damned cant remember what it is!) so maybe not.
Used a trial version of NOD32 at one stage but didnt like it.
Not sure where to go from here actually.