Hello,
I have tried re-downloading and re-installing limewire a couple of times now but after installation is complete, i run the program but instead of opening, i get this message:

One or more necessary files appear to be invalid. This is generally caused by corrupted installation. Please try downloading and installing LimeWire again.
If the problem persists, please visit Lime Wire » Official Website & Free Download, BitTorrent « and click the 'Support link.
Thank you.

LimeWire version 4.18.3 Pro
Java version 1.6.0_06 from Sun Microsystems Inc.
Windows XP v. 5.1 on x86
Free/total memory: 31252080/33357824

com.limegroup.gnutella.gui.GUILoader$StartupFailed Exception: Unknown algorithm: MD5
at com.limegroup.gnutella.gui.GUILoader.sanityCheck(G UILoader.java:281)
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!

_________________

I recently re-formatted my computer but this has never occurred before. I've also tried every way possible as well as uninstalling and reinstalling. I also recently installed Java, but there must be some other reason to why i keep getting that particular message.

Hope someone can help out.
Thanks!