To drum up demand among people who aren't in the market for a new PC, Microsoft is taking limited pre-orders, selling some for as little as $50.
People who buy Windows Vista Home Premium, Business or Ultimate computers starting Friday can contact their manufacturer for a free upgrade when Windows 7 becomes available.
Microsoft is hoping Windows 7's debut will be much smoother than Vista's. Vista was plagued by delays, and many people complained it was sluggish and didn't work with existing devices and programs.
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