Hi Steve,
I am a bit concerned when you say that you have been told that WinXP cannot be loaded on your new PC. I understand that you have loaded a 32 bit version of Win7 but please check that your PC is not a 64 bit machine – if this was the case then you cannot use the parallel port with Mach3 on that PC, an external motion controller would be necessary.
(I have never tried loading a 32 bit OS onto a 64 bit PC but I am guessing that it’s possible).
From your pics the LPT parallel port address, which is entered into Mach3 for the Port #1 address is 0xE100 (Config. / Ports & Pins / Port Setup and Axis Setup).
Tweakie.