[ch_123]

We might have to agree to disagree here, but I think the scenario where the IT guy uses XP and "finds" a license for it is the approach I would take if I was put in this situation. If the vendor for the CNC machine certified/tested their machine against Windows XP, and does not offer any support for new operating systems, I would be very reluctant to use anything else - whether it is another version of Windows which could accept the same drivers, or an open source clone. Again, I'm assuming that ReactOS manages to be a perfect clone, which is may or may not be in practice.