Emergency! PC Auto Shutdown method confirmation, thank you!

Users questions: I would like to set the computer to automatically shut down, get a way, is that if you intend to keep your computer in the morning 1:00 (1:00) Shut Down, click "Start" "Run", type "at1: 00shutdown-s", to 1 am the computer appears "System Shutdown" dialog box, The default 30-second countdown and prompts you to save your work. But a friend of mine told me that a virus like this, and can not stop the shutdown ... so I wish to ascertain, asked master told me the other if this not, ask what method was time to set off.
Experts answer: can use this To shut down. This command is not the virus, is safe to DOS commands. Cancel shutdown operation is: Shutdown-a what he said was shock. Absolutely not the same thing, ease of use. No problem.
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