I googled thusly: http://www.google.com/search?q=windows+7+release+candidate+expiration First hit http://support.microsoft.com/kb/971767 explains: Windows 7 RC Windows 7 RC expiration Effective June 1, 2010, Windows 7 RC will expire. To continue using your computer, you should prepare to install the retail release version of Windows 7 or install an earlier version of Windows before the June 1, 2010 expiration date. You will be unable to upgrade from Windows 7 RC to the retail release version of Windows 7. However, you can back up or transfer your data to your next or previous operating system. Windows 7 RC expiration functionality Effective February 15, 2010, the expiration notification process begins: . Windows 7 RC users receive an expiration notification in the task bar one time per day. . Windows 7 RC users are presented with the Notification Wizard one time every four hours and then one time every hour. Effective March 1, 2010, Windows 7 RC enters the next phase of expiration: . Expiration notifications in the task bar continue. . Computers that are running Windows 7 RC restart every two hours. Important When the computer restarts, your work will not be saved. Effective June 1, 2010, Windows 7 RC expires: . Windows starts to a black desktop. . Windows 7 RC users are presented with a Windows Activation screen. The screen states that the Windows that you are running is not genuine. . Computers that are running Windows 7 RC restart every two hours. So the short answer is back-up and reinstall. Might be a good time to investigate the Windows Easy Transfer facility: http://www.microsoft.com/windows/windows-vista/features/easy-transfer.aspx Also, a Windows Team blog post regarding RC expiration (which refers to the KB article above): http://windowsteamblog.com/blogs/windows7/archive/2010/02/01/important-remin der-regarding-expiration-of-the-windows-7-rc.aspx -Geoff > -----Original Message----- > From: Technology Discussion at UVM [mailto:[log in to unmask]] On > Behalf Of Larry Kost > Sent: Tuesday, February 16, 2010 9:31 AM > To: [log in to unmask] > Subject: Windows 7 > > I have a Faculty member who installed the pre-release version of > Windows 7 > and it is now saying that it will stop working in 13 days. Is it > possible > to upgrade to 7 Enterprise, or will it require a clean install? > > LLK