How did you uninstall the older version ???
If you did it via Add/Remove programs then that can cause problems!!
The correct way to uninstall is Start > All programs > Limewire/Uninstaller
Use your computer's search to look for all files & folders with limewire in the name. If you can't delete them, reboot into safe mode & then try. If they still won't delete, try one of the tools here...
Incomplete Download File won't delete at all.
Try that and then try re-installing the latest version....