The control systems run XP, Vista, or maybe Windows 7 (not sure about 7 yet). This is true of almost all military desktops, and all office automation servers, and most specialized servers (well, Windows Server 2003/2008).
I'm not sure what OS is on the aircraft; I think it's probably a RTOS for flight control and possibly separate processors (running whatever) on a bus for sensor packages. A lot of UAVs have interchangeable sensors, and sometimes a special camera, electronics package, etc. costs more than the airframe, is developed independently, etc.
There are tens (hundreds worldwide?) of UAV platforms in the US military, ranging from tiny little throwable tactical systems up through almost U2-sized "real aircraft, minus a pilot" like Global Hawk.
I'm not sure what OS is on the aircraft; I think it's probably a RTOS for flight control and possibly separate processors (running whatever) on a bus for sensor packages. A lot of UAVs have interchangeable sensors, and sometimes a special camera, electronics package, etc. costs more than the airframe, is developed independently, etc.
There are tens (hundreds worldwide?) of UAV platforms in the US military, ranging from tiny little throwable tactical systems up through almost U2-sized "real aircraft, minus a pilot" like Global Hawk.