Anti,
Basically agree with Slasher, but I find it helps to be logged onto the Internet before you invoke Live-update (my version of Norton AntiVirus doesn't seem to know how to dial correctly).
I download new virus signatures about once a week - it's usually about 2 - 2.5Mb. Well worthwhile - it nails infected MS Word .doc files stone dead as soon as they hit my reader queue - usually catch two or three a month. Make sure that you enable it to check your incoming mail and attachments.
IFR: Are you referring to Norton Utilities or Norton AntiVirus? Agree that Utilities can cause a few problems - best left disbled so that they're there when you need 'em (Speedisk is much better than MS's Defrag); But I've never had any problems with Norton AntiVirus.
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Feline
(I Sit, I Watch, I Smile)