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-reminder-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