Windoze Box

Howdy;

I've been into Unix/Linux for ages now, so when it cones to Windoze
stuff, I'm pretty much a complete tyro.

I've got an old server box I'm considering getting fixed up, and
installing Windows on it. My question is which OS level(s) is/are
optimal for CAD-CAM-CNC et al?

I guess I should ask about which Windows software is best/easiest
to setup/use as well. Not to forget the hardware, off course.

I've seen bits and snatches of all this on list over the years, but
I don't think I've ever seen it handled from the ground up. So I
guess what I'm saying is; What is the more or less complete, ideal,
low budget system?

Thanks.

Bill