Note that you also have to delete C:\Documents and Settings\(username)\Application Data\LimeWire when you're deleting preferences. I've sent a message to Lord of the Rings about updating the referenced instructions. (Many thanks to Lord of the Rings for writing up those instructions.)

(For you international users, you'll need to either look up the value of your APPDATA environment variable or search your machine for LimeWire folders that are inside a folder that's inside your user's home folder. APPDATA defaults to C:\Documents and Settings\(username)\Application Data\ on English versions of Win2k and later. If APPDATA isn't set, then LW won't use %APPDATA%\LimeWire)