Within XP Pro + SP1, I had Nortons Systemworks installed.
I uninstalled it and have Trend's PC Cillin AV running.
I recently updated my ATI Gigabyte 9200 VIVO card drivers and noticed during installation a message along the lines of 'Symantec NetDetect won't let you install this file as it's dangerous' or something like that.
WTF? I thought I'd got rid of all Nortons.
So I found two Symantec files on C drive, within Windows Task Scheduler and Program Files/Common Files, which I deleted under Safe Mode.
I then rebooted and used JV16 registry cleaner to try and get rid of two Symantec entries, but no go.
I then went into regedit and again could not delete any Symantec entries, it wouldn't let me.
I have two unknown devices showing in My Device Manager now, both video related.
I believe they're drivers for a secondary Monitor display for the ATI card, which is still shown as 'AT 9200 Series - Secondary' within the Adaptor section.
Driving me frickin' nuts.
I'm seriously thinking of wiping this Partition (it's only 12Gb for OS, Office and stuff) just to be rid of Nortons.
I've quite enjoyed Nortons AV on my systems, but I'm beginning to think all the criticisms of it are well-founded.