LONDON, ENGLAND - OCTOBER 21:  A computer store employee stacks copies of Microsoft's new operating system 'Windows 7' ahead of its official launch at midnight tonight on October 21, 2009 in London, England. Microsoft's much-anticipated version of its Windows operating system for PCs aims to eradicate many of the problems associated with its predecessor 'Vista'. Getty Images logo Getty Images 28 months ago

LONDON, ENGLAND - OCTOBER 21: A computer store employee stacks copies of Microsoft's new operating system 'Windows 7' ahead of its official launch at midnight tonight on October 21, 2009 in London, England. Microsoft's much-anticipated version of its Windows operating system for PCs aims to eradicate many of the problems associated with its predecessor 'Vista'.