Sorry to hear you've been scammed. Have a look through these 2 threads, the first one's an epic but it's got heaps of info & (I think) a list of known scam sites
http://www.gnutellaforums.com/showthread.php?t=28751

http://www.gnutellaforums.com/showth...threadid=44499

The second one has info about getting your money back, lots of good advice from people who've done it. It's worth reading, you never know... might help you.
Make sure to let your bank/CC company know straight away, they might be able to cancel your transaction. Most have a department that deals with fraud/scams.

LimeWire's open source, so anyone can get hold of the source code. Unfortunately this includes scammers!
If the crap version you have doesn't work, get rid of it. I'd advise you to get rid of it anyway... you never know what malware might have been included. If you want to download LW basic (free), get it from the official site here
http://www.limewire.com/english/content/download.shtml
That way, you'll get a clean version!