Norton has a firewall and Norton sucks. Really. Install Avast (free anti-virus, firewall) http://www.avast.com/ then uninstall the plaque also known as Norton AV. You will be better equiped against viruses and LW will function better.

Bonne chance!

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Liens d'intérêt /Links of interest:
Gnutellaforums en français /The House's rules you have to respect / First search the forum, then create a thread / Free software alternatives! - Logiciels alternatifs gratuits!/