SEATTLE -- Prices for Microsoft's Windows 7 computer operating system will be largely in line with those for Vista.

In announcing prices Thursday, Microsoft Corp. says people who buy computers before the new system goes on sale in October will get free upgrades.

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.