Go to administrative tools, task scheduler.
Then right click on Task Scheduler and select Create Task
Name the task, in this example “Reboot Weekly Saturday 2am”
Change settings to run whether user is logged in or not. Change User/Group and type in SYSTEM.
On the Triggers tab, select New and fill in your schedule and make sure to check Enabled at bottom of screen
On the Actions tab, select New Action, Start a program, and browse to “c:.windows/system32/shutdown.exe” and add “/r” in the arguments box