Did you change your modem/router during all the upheaval ?

Leave Win firewall off & just use Norton. Are you sure it's configured to allow LW access?

Here's a link to the sp2 patch that I used, there are 3rd party ones around if you'd prefer not to use Micro$oft :
http://support.microsoft.com/default...5bLN%5d;884020

See how you go with it, post back here if it's no good!