Other people have had the same problem with WoW, you just might not be able to have them running at the same time Did you have LW working alongside WoW before? Have a read of the threads below & try the advice given.

http://www.gnutellaforums.com/genera...aunch-wow.html
http://www.gnutellaforums.com/genera...ting-down.html

You could also try the tips in the post below & see if that makes any difference
Reduce the drag caused by LW