Hi Jennifer,
Where did you buy LW from?? Was it www.limewire.com? That's the official website. LW basic is free, LW Pro costs $18.88 USD & covers you for 6 months of updates & email support. There's no pin to enter...if you buy Pro, you'll recieve a link to your Pro personal download page & that's only after your payment's been processed.

If you bought from another site, you've been scammed & should contact your bank/CC company to report this. They will possibly be able to cancel the transaction for you.

If you did buy from a scam site, I'd suggest you go to the official site & download the free basic version Have a look through the link below, it has info about so-called memberships & scam sites:
http://www.gnutellaforums.com/showth...threadid=28751

The license problem that you were having is simple to overcome, have a look in the thread below for instructions
License (click)