So you've uninstalled LW but these popups are still coming? Before you uninstalled LW, was it opening all the time at random & refusing to stay closed? If that's the case then it sounds like you're infected. Have a look at the threads below...there are lots of links to different fixes to try that have worked for different people. Otherwise, there are also links to help forums that specialise in malware removal. Make sure to give AVG Free a try...it's helped quite a few people.

http://www.gnutellaforums.com/genera...s-options.html
http://www.gnutellaforums.com/open-d...tml#post307873