Not trying to ignore anyone, everything you suggested I have tried and failed. If yours is still working could it be you are on a google system in Australia or in some other country? And the ones effected are on a North American system?
Computers I have worked on are... Dell, Gateway, ASUS, ZT, and HPs some with XP, Vista and two with Win7 64 bit and a 32 bit. All quite the same night about a week ago. All of course are in the USA. Oh yes and mine is also down on all 3 of my personnel computers.