I don't know about XP, but in 2000 you go to Documents and Settings/your username/.limewire

move the files limewire.props and tables.props out of that folder (don't delete them just in case). these are your user settings.

if you also want to get rid of the host cache, also move gnutella.net out.

then restart limewire and it should be like new (limewire will create new .props and a new gnutella.net file, if you want your old settings back, just copy the old files back and overwrite the new ones).

sorry, it took me a while to figure out what you wanted. i hope that helps.