Norton slows down my computer which is currently being configured for use over here with the internet by a lot. Takes about 5 minutes for it to start up, so I wouldn't use it if you need speed on your computer, and most of us do.

A little off-topic, does Vet Anti-Virus tend to be a memory hog? The computer I'm using now gets horrible lag...or does Spyware Doctor do that? I doubt it is Spyware Doctor tho.