Is it necessary to buy a CD drive for my new machine? it seems that DvD drives run both, and I haven't used an actual CD in ages on my current machine, but is there some hidden reason to buy a CD drive as well?
No need to buy a CD Drive...
All current DVD or Blu-Ray drivers meet all the requirements need for a CD. I would just recommend buying at least a DVD Burner drive, so you can burn CD's & DVD's.
Have you tried this Microsoft web page? Click on the run now button.