One of the media players I use has an alarm you can set to exit windows. It's called jetaudio, in case your wondering.
 
btw I'm sure someone knows of a script or something, I just thought I'd throw it out there in case it takes a while

http://www.leinensoft.com/software/command.htm
 
You could always schedule one of these apps. Whats the reason for this request?
 
You may also have to disable the "modififed" 2003 shutdown screen with a GPO.

Doesn't Windows Server 2003 have the shutdown.exe ditty that's also included with XP?
 
You should be able to create a scheduled task to run it at a specified time.
 
I couldn't find an article for Windows 2003 on the MSKB but here is one for Windows 2000. It should be a similar exercise.
 
http://support.microsoft.com/default.aspx?scid=kb;en-us;317371&Product=win2000

Quote: http://www.leinensoft.com/software/command.htm

You could always schedule one of these apps. Whats the reason for this request?

You may also have to disable the "modififed" 2003 shutdown screen with a GPO.

Hey thanks! There are a few handy tools there I found a tool that I could use to automatically reboot Win98 machines a few years ago but it wasn't as straight forward as these.

I'm a little curious about the need to reboot a server daily myself though. That just seems like asking for trouble.