See the tips in the link Birdy gave you. Also see get your $$$ BACK!!! (music members). The normal recommendation is to try cancelling through the site 1st if it's within 7 days of your buying it. Next step is cancelling thru your credit card by speaking directly with the fraud & scams dept of your credit card co.

I'm not sure if that exact site is mentioned, but you may find their main page listed here Known Scam Sites (click on link)

BTW start off with LW Basic (FREE), then if you like it get the Pro version which is US $18.88. http://www.limewire.com/english/content/download.shtml