I use Windows 8.1 Pro 64 bit on my main computer with coreldraw X6. It drives my Epilog Helix via ethernet, my Graphtech Plotter, my Designjet printer and several other antique laser printers.
My engravers and CNC make use of Mach3 software and the parallel port, and must remain on XP. So I have a bunch of older Dells I picked up for free dedicated to that task. Since they are not running Corel or doing email or web browsing, their lesser power is not an issue. They have what it takes do drive their respective machines.
To drive them with more current OS requires a USB motion controller that currently runs about $3200 per machine - good incentive to stay on XP!
Epilog Helix Laser 40w
Rotary: NH Vanguard 7000 with Q1E Controller
Graphtec FC8000-75 Plotter
Sand Carving (Stone and Glass)
Phoenix CNC (12X18")
Corel Draw, Vectric VCarve Pro