Whilst LW is closed, delete the LW preferences, http://www.gnutellaforums.com/genera...der-vista.html

If same problem, check points #5 & 6 here: Fixes for Limewire (click on blue link)

If 'still' problems after that, then a clean install using the offline installers: http://www.gnutellaforums.com/333278-post2.html

As far as the LW site goes, check your security software. If you are using PeerGuardian for example, turn off the URL/site blocker. Might be another security software you are using that's causing it. Could also try clearing browser cache. I hope you're not using internet explorer.