The only thing I can suggest is to try a complete reinstall of Limewire and Java. Delete .limewire folder (it's the preferences folder) your incomplete folder. Uninstall using the uninstall file in your Limewire programfolder (do not use add/remove programs as it may mess up your Limewire). Then do a search for Limewire and delete everything it finds (unless offcourse you have a saved folder for music etc. that you called LImewire...). then press start and run regedit, go to HKEY_LOCAL_MACHINE>Software and delete the limewire folder from there if there is one. Delete Java using add/remove programs. I would recommend that you do a malware sweep of your PC. 10% CPU usage isn't normal when not running any programs.

Then reinstall Java using the link Grandpa posted and then download the latest offline installer for Limewire. Install that and pray.

BTW I have had this problem once myself and I got rid of it somehow through something of the above. Now it's running great. Using 4.10.9Pro (haven't tried to update yet)