I don't know but can suggest a couple of things.
1. Repair LimeWire using the Add/Remove Programs utility. Go to Control Panel then Add/Remove Programs & click on Limewire on the Change/Remove button & it comes up with options and one of them is Repair. Try this.
2. Right-clicking the Limewire icon and going to properties and changed compatability setting to Windows 2000.
3. Update your Java
version 1.5 (take the JRE)
4. Delete the LW Preferences folder called
.limewire (whilst LW is closed!) & found here: Windows NT 4.0 / 2000 / XP: C:/Documents And Settings/your_username/.limewire OR Windows 98 / ME: Your .limewire folder is in "C:\My Documents" (But make a note of your settings, b/c once you delete the Prefs folder you'll need to reset them.)