I have no idea what changes LimeWire2009 has so it may install a little differently.
Normally for LW to uninstall you go to Start menu -> All Programs -> LW -> Uninstall.
Check within the Programs folder itself, find that directory folder, look inside the LimeWire2009 folder & see if there is an uninstaller inside the program folder. After doing that, check Add/Remove Programs Control panel & see if it's listed. Normally you do not uninstall LW this way but LimeWire2009 might be different.
I'd recommend deleting your LimeWire2009 preferences folder & installing the 'real' LW from scratch, see
http://www.gnutellaforums.com/333278-post2.html on how to do.