Well there are lots of scam sites out there. As long as you didn't pay your money anywhere else other than
http://www.limewire.com/english/content/download.shtml then you should be ok. If you want to know about scam sites, then see a couple of links here 1.
Membership? - **WARNING ** BEWARE** - Download p2p Clients ONLY Thru Official Sites (click on link), & also this one which is the same thread actually, 2.
Known Scam Sites (click on link)