First off I'm very green in this whole process. I'm building a cnc router and getting to the electronics (which is my weakness). I purchased a driver kit with motors for a parallel port setup. I thought both old computers I have where equipped with a parallel port. Turns out 1 is and it sounds like it's on its last leg. The other does not have a parallel port only USB drive. I found a usb to parallel port adapter online and was wondering if this would work and if so what other setup would I need to do. Any help would be appreciated. 

I found a usb to parallel port adapter online and was wondering if this would work

no way

Lots of second hand PS'c on ebay for not a lot of cash most with LPT ports

You need a USB motion controller like a UC100.
If you decide to go that route, make sure it's not a cheaper chinese fake.

Ok thank you guys for your input. I will see how long the one computer lasts then go from there.