Shutdown your PC with Timer

Procedure 1:

1. Right click on your desktop and choose "New=>shortcuts". 
2. In the box that says "Type the location of the shortcut", 
type in "shutdown -s -t 3600" without the quotation marks and click next. Note: 3600 are the amount of seconds before your computer shuts down. So , 60secs*60mins=3600secs. 
3. Make up a name for the shortcut and you’re done. 
You can change the icon by right clicking=>properities=>change icon=>browse 

TO ABORT: 
To make an abort key to stop the shutdown timer just create another shortcut and make 
the "location of the shortcut" to " shutdown -a" without the quotes.

Procedure 2:

Here is another trick to shutdown at a specific time, for example you wish to shutdown at 11:35am. Type this in 
start=>Run 
Type Code: at 11:35 shutdown –s 

TO ABORT: 
Code:shutdown -a