a cd/dvd drive is by far the easiest way to get windows setup and working. once you have windows installed, then you really don't need one in the cabinet, you can always install from a flash drive, or over the network. you should be able to pick up a dvd rom drive online for around $20 shipped..or if you have one in another pc, it would only take a few minutes to swap one out. if not, check a local pc repair shop, i'm sure they would have spares lying around they'd let you have for next to nothing.