I must install Mathematica 10.4 on a PC, running Windows, specially intended for this job (basically, no other software will be used there).
I'm quite free about choosing the OS (Windows 7, 8, 10, etc.), but I haven't well founded criteria.
As a rule of thumb, taking in account the narrow mission of the system, I speculate that the best fitting OS should be capable to squeeze the hardware without overburdening the machine with unwanted (and here totally unnecessary) features.
Please, can you give any hints arising from practical examination ?