Microsoft unveils Windows 8

Microsoft CEO Steve Ballmer's future may depend on the success of Microsoft Windows 8, which he unveiled in New York on Thursday.

Microsoft CEO Steve Ballmer gives his presentation at the launch of Microsoft Windows 8, in New York,  Thursday, Oct. 25, 2012. Windows 8 is the most dramatic overhaul of the personal computer market's dominant operating system in 17 years. (AP Photo/Richard Drew)

Microsoft CEO Steve Ballmer gives his presentation at the launch of Microsoft Windows 8, in New York, Thursday, Oct. 25, 2012. Windows 8 is the most dramatic overhaul of the personal computer market's dominant operating system in 17 years. (AP Photo/Richard Drew)

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