Do you mean that once you disabled the Norton firewall everything is working OK again? Just to be clear on this it might be prudent to run some firewall to protect your PC particularly if you're on broadband. See the earlier topic about keeping your PC clean of nasties. The usual advice for doing this is fourfold:
<!--EZCODE LIST START--><ol><li>Install, configure and keep updated an anti-virus scanner</li><li>Install, configure and keep updated an ad-ware/parasite/etc. scanner (or two!)</li><li>Install, configure and keep updated a firewall (particularly for broadband users but perhaps even for dial-up users)</li><li>Keep your system and applications updated with latest service packs/patches etc. [broken link removed] is useful in this respect for example.</li></ol><!--EZCODE LIST END-->