The Windows 7 RC will expire completely on June 1, 2010. The Computers & franq = 167706 "target =" _blank "rel =" external "title =" notebooks "> Notebooks + Computers & franq = 167706" target = "_blank" rel = "external" title = "Computer"> computer that is running this version product every two hours off and the files will not be saved during this action (automatic shutdown of your computer will start in MARCH 2010). Additionally, the wallpaper is changed to a solid black background with a message to the desktop. You will also receive periodic notifications that Windows is not genuine. This means that your computer may not be able to get updates or downloads that require genuine Windows validation. To prevent this reinstall a previous version of Windows or move to Windows 7. In both cases, you need to do a custom installation (clean) to replace the RC. Like any clean installation, it is essential to back up your data and reinstall your applications on the new Windows installation, and then restore the data. For more information on replacing the RC version, read the Microsoft knowledge base KB 971767. You can also access the Windows 7 Forums.

Source: http://technet.microsoft.com/pt-br/default.aspx