Are you still running Windows 7 Release Candidate? well if you are then its time to think about buying and installing the release version of Windows 7 or re-installing your previous Windows version as come Monday you will start experiencing the below effects, from the shutdown every two hours to not being able to get any more Windows Updates.
Starting on March 1, 2010 your PC will begin shutting down every two hours. Your work will not be saved during the shutdown.
The Windows 7 RC will fully expire on June 1, 2010. Your PC running the Windows 7 RC will continue shutting down every two hours and your files won’t be saved during shutdown. In addition, your wallpaper will change to a solid black background with a persistent message on your desktop. You’ll also get periodic notifications that Windows isn’t genuine. That means your PC may no longer be able to obtain optional updates or downloads requiring genuine Windows validation.