Thanks Cropwell. I have just downloaded and saved for future reference.

Thanks for the advice Jazzcnc. It looks like your answer to question 2 would be my most viable option.
So, taking that advice, and that I have a machine, a pc, with Mach 3 already on it. Would I be some where close if I were to assume all I need is an ethernet cable, and a control board, similar in features to the one already installed and the associated plug-in/driver for said board?

Cheers for the help, I have learned something today. I bought it as a working concern, and I've only had this trouble since the hard drive went pete tong and I've had to start again with absolutely no knowledge of the build or how it all went together.