Its your choice Bob,
So you paid for a three legged donkey called Norton,so why stick with a program that costs the earth, misses most of the threats that are found by AVG FREE antivirus, & its known to be problematic with file sharing apps,& there's so many versions it may be Quicker asking Norton how you can configure it to work with Limewire.
But if you don't answer Questions I'm just left in the dark as to how I can help, Look back over this thread & try to give feedback.
Check the vista forum
good luck

P.S...The other point you made sounds more like a Vista bug, a symptom, not a cause.

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mickjapa108