In order to find the preference folder in Vista you will first have to enable show hidden files and folders. You can do this by clicking on Start/User Name
(Attachment #1)/Organize/ in the drop down window choose Folder and search Options in the next drop down window choose View and put a tick mark in in the Show hidden files and folders. Then click apply to folders.
(Attachment #2)
Once that is done the AppData file will show up click on it then choose Roaming. In the window that shows up right click on the LimeWire file and delete it.
( Attachment #3)
Edit:
C:\Documents and Settings\*yourusername*\AppData\Roaming\Limewire
The
AppData folder is a
HIDDEN folder so you need to change option to show all hidden files & folders before you use the
Vista search for it as described by Grandpa. (GiF animated sample image added below to help show you.) You can also see birdy's link in post #2 below for another tutorial on how to show Hidden files & folders in Vista.
* Note: you may wish to save your Downloads.dat file, see
Back up your Downloads file before deleting LW's preferences folder about retaining previous incomplete files.
.