1st read the top sticky in this forum, and join the legion of the scammed. Sorry to say that, but you are not alone.
The basic version of LimeWire is free and can be downloaded here.
http://www.limewire.com/english/content/download.shtml
contact your credit card company or bank and explain what has happened. You might be able to get them to reverse the charges.
I would uninstall that version as it appears to be bugged, flawed, or loaded down with spyware adware, and install the free version from the official LimeWire website in the link above.