You might not have a folder named .limewire...that was the location of the prefs folder in much older versions of LW. The new location is C:\Documents and Settings\your usename\Application Data\LimeWire.

The Application Data folder's hidden by default, so you'll have to show hidden files & folders to ba able to see it.

Try the advice in this thread...there's a bit of info about finding the prefs folder, plus another fix to try if that doesn't work.
http://www.gnutellaforums.com/connec...t-fix-try.html