I went in last night to set up the cnc software on the beefiest/newest looking tower, but it has Ubuntu installed.
There's a windows 7 key on the top, if anyone more competent with computers feels up to making an install USB and replacing Ubuntu, I'd be very grateful. If not I'll probably be able to do it next week.
Also, if anyone has an objection to me removing Ubuntu from that tower, speak now or forever hold your peace.