Automatically+Turn+Off+Windows+2

You can use the default Windows 7 power management options to shut down your PC automatically if it hasn’t been used for a certain period of time.
 * Automatically Turn Off Windows **

However, Windows 7 measures usage in terms of the mouse or keyboard being touched. If you’ve left your machine running while a large file downloads for example, you may well come back to find that the download failed, since Windows shut down the PC before it had time to complete. Similarly, if you have left your PC switched on to defragment the hard drive, you may find that the defragmentation process failed, since Windows shut down before it could complete. One way to solve this problem, is a smarter power management tool, such as AllOff Lite.

AllOff Lite is a Windows activity monitor and automatic shutdown tool that turns off your PC if there is no __mouse, keyboard__ or __CPU__ activity for a specified number of seconds. By default, the application initiates automatic shutdown if the keyboard or mouse remain inactive for 900 seconds, or the average CPU load remains below 15%. This last aspect is particularly useful, since once a process such as defragmentation has completed, the CPU usage will fall to a low level, and AllOff Lite will know it is safe to shut down the machine.

You can download AllOff Lite here:

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