PC World - With dozens of Windows PCs available at retail, each preloaded with one of several versions of Microsoft's Windows 7 operating system, it's far too easy to buy a version of the OS that doesn't meet your needs. Maybe that bargain Acer Aspire One netbook you're eying runs Windows 7 Starter, but you'd prefer Windows 7 Home Premium, which adds the slick Aero interface, better media tools, and the ability to run more than three apps at once.

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