I don't use any and haven't for years
Simon... I would be interested in understanding how you stay protected. Some platforms have built in security, however, this may not hold true for others so while you say you don't use any, people may assume they don't need to either. This is dangerous. Excellent point about staying patched! (be aware that MS Windows XP Service Pack3 has caused people issues. We're still SP2 at work because of it!)
frozen one.... As part of my profession, I perform a Security Co-ordination and Administration role. I suggest you do some homework on other or alternative security products if you are not satisfied with Norton. They aren't the only game in town. Going out to the Internet without security is like having sex with no condom. You're going to get infected -- it's just a question of time. With the Internet, it's usually seconds.
At work we use Symantec's Firewall and AntiVirus (Corporate editions). Symantec is owned by Norton.
Regarding your "pokey at times computer", that could be a multitude of things including:
- massive numbers of temp files accumulating on your harddrive that need to be cleaned off
- fragmentation of the files on your harddrive
- 'spybots' (like roings, Trojans etc.) running that you don't even know about.
If you haven't done it for a while, start by defragging your harddrive.