Limewire unable to load
 

I just d/l and installed Limewire 4.18.1 Iwhen I try to start the Limewire I receive a popup stating "unable to load, reinstall the program".
If I try starting agin, I receive the following pop-up.

LimeWire version 4.18.1 Pro
Java version 1.6.0_03 from Sun Microsystems Inc.
Windows XP v. 5.1 on x86
Free/total memory: 31326440/33357824
com.limegroup.gnutella.gui.GUILoader$StartupFailed Exception: invalid themes.jar
at com.limegroup.gnutella.gui.GUILoader.sanityCheck(G UILoader.java:275)
at com.limegroup.gnutella.gui.GUILoader.load(GUILoade r.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.limegroup.gnutella.gui.Main.main(Main.java:45)
STARTUP ERROR!

Can anyone help. Thanks.