I run the Norton, probably out of habit more than anything else. I've never had any problems with it, I usually turn off the popup notices and automatic stuff. The SystemWorks tools are ok, it does a decent job of keeping the system and registry clean and the PC running smoothly, but I have it set be all manual, I choose the time when all that stuff runs. The AV and some other tasks run in the background, if I'm playing a real CPU intensive game I sometimes turn it off.
On older machines (especially lower RAM machines) Norton AV is a pig and will make the computer unusable even when just monitoring. My dad got a virus a while back on an old Win98 computer I gave him, I used Norton 2003 to clean it, then decided to install it. Big mistake. The machine could barely boot, it was thrashing the virtual mem so much. I had to boot in safe mode just to uninstall.
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