search for limewire delete everything you think is limewires
delete C:\Documents and Settings\shared location\.limewire
delete C:\Program Files\LimeWire\LimeWire 4.0.7
by the way the folder/\ there I gave you the default location it might not be specifically there
make a google search on how to delete invalid programs.
learn and get rid of the old copy...
install the file which you downloaded from www.limewire.com
install the latest java which you'd download from java.com
don't ever delete these files again before uninstalling!
if this doesn't work wait until someone else gives a better answer if that other person doesn't come your screwed and an extreme which I wouldn't go to is reinstalling windoz