Yep a few more ...
Go to your add/remove programs and see if you have this update...
"Security Update for Windows XP (KB931261)"
If you don't try these...
Right-click the Limewire icon and going to properties and change compatability setting to Windows 2000. (but only if you're using Windows 2000 or later.) Somebody reported changing to Windows NT compatibility fixed their problem despite not using that operating system version.
Right-click on the Limewire icon on the desktop and click on Run as. Then it should come up showing the current user and then switch it over to Administrator. (but 'only' if you're the admin of your comp.!)