There is a command line utility shipped with the Windows Resource Kit called SHUTDOWN.EXE that can be used to reboot...
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the local machine:
shutdown /l /r /y /c
Where /l tells it to shutdown the local machine, /r to reboot, /c to close all programs and /y to avoid having to say yes to questions. You can then combine this with the AT command (don't forget you need the Schedule service to be running (Start - Settings - Control Panel - Services) to use the AT command) to make this happen at a certain time:
AT (time) shutdown /l /r /y /c e.g.: AT 20:00 shutdown /l /r /y /c
Additions to the AT command could be:
so it happens every day, e.g.:
AT 20:00 /every:M,T,W,Th,F shutdown /l /r /y /c
You will then be given 20 seconds before the machine is shutdown. To abort the shutdown type:
shutdown /l /a /y