If you still have Windows 7 Beta please install Windows 7 Release Candidate soon! Starting July 1st the Windows 7 Beta will shut down every two hours. 

  • For Beta, bi-hourly shutdowns will begin July 1st, 2009. You will be alerted to install a released version of Windows and your PC will shut down automatically every 2 hours. On August 1st, 2009 if you are still on the Windows 7 Beta your license for the Windows 7 Beta will expire and the non-genuine experience is triggered where your wallpaper is removed and “This copy of Windows is not genuine” will be displayed in the lower right corner above the taskbar.
  • For the RC, bi-hourly shutdowns will begin on March 1st, 2010. You will be alerted to install a released version of Windows and your PC will shut down automatically every 2 hours. On June 1st, 2010 if you are still on the Windows 7 RC your license for the Windows 7 RC will expire and the non-genuine experience is triggered where your wallpaper is removed and “This copy of Windows is not genuine” will be displayed in the lower right corner above the taskbar.

    • More info at the Windows Team Blog