I must ask again...
WTF are they *doing* running these things on what is pretty obviously a Windows platform, and why is their security so piss-poor that viruses can get onto these systems in the first place.
Now I can admit that Windows has it's place in the software world, but for something as critical as controlling armed military drones on what are likely often highly secret missions, that is *not* the appropriate place. Linux or other more secure software should have been used for an application like this. Something that is *not* compatible with every run of the mill virus out there.
(Of course if they had used a free OS, probably whoever was in charge of software procurement wouldn't have gotten their no doubt cozy deals with the vendor. So of course that couldn't happen.)