JimBob,
Windows7 comes in 2 major categories - 32-bit and 64-bit. There is no support in 64-bit OS's for the parallel printer port, so there is no way for Mach3 to talk to it.
To overcome this obstacle, you have a couple of choices.
1) You can uninstall Windows7 64-bit and re-install Windows7 32-bit. Then Mach3 will run just fine - and before certain individuals try to tell you otherwise - I am doing that on one of my machines and it works just fine.
2) You can replace the parallel card with a SmoothStepper. There are several sources of SmoothSteppers, but they all (as far as I can tell) are variations on the designs offered here:
http://warp9td.com/
You will see on that page that you have 2 choices in SmoothSteppers - USB and Ethernet. The Ethernet seems favored by those who have installed both. They say it runs smoother. I installed the Ethernet version and Mach3 certainly rune smoother than the old parallel port method.
That's not to say you don't add another level of complexity to your installation, but "progress comes at a price" or something like that.
If you decide to go that route, I'll be happy to help you through the installation, as it is a little less than polished. :wink:
FWIW, I bought my Ethernet SmoothStepper from this site:
http://www.soigeneris.com/ I have received good support from Jeff, the owner (he also is a co-developer of the ESS and is prominent on the Warp9 site).
Hope this helps.
Gary