"Signed up for this service"? You don't sign up per se for Limewire. In the official Limewire site that is. you pay for a product once (much like you pay for a tomato once) and then that's it. If you signed up for something (as in adhered to a service, payable in monthly basis for example) then it's very likely you got scammed.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-