Do you want to completly uninstall Limewire?? If you are trying to upgrade, it will delete the older version when you upgrade to the newer version. You Don't have to delete anything. Below are instructions to uninstall Limewire completly.
This is for XP but I'm sure Vista is similar. You'll have to try.
Go to Start > All Programs > Limewire > Uninstall.
Go to Start > Search > All Files/Folders. Type in limewire > search.
Delete Everything Limewire. If there are files that won't delete. Look here.
Incomplete Download File won't delete at all. Then Reboot.