Firstly, welcome to the legion of the damned. You have been scammed, there is no such thing as lifetime membership to Limewire, the basic version is free, and the pro version is around $18.99 for 6 months. Whoever you bought LW through have ripped you off.
Depending on where you live, its not legal to dl copyright material.
LW is a Peer to Peer program, and as such they take no responsibility for the files shared on the system, well, except in the new version. It may be worth your while having a look at the stickys on page one for some better explanations than mine.