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I have seen that quite a number of times that my windows gets restarted automatically. I don't know the reason.

Is there any way that i can completely disable windows shutdown or restart so that no software or system command can restart or shutdown my system.

Even i should also be not able to restart it.

Only way to turn off is direct power OFF.

Is it possible

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5  
you should look for diagnosing why your computer keep restarting, it may be overheat ... –  Revolter Jun 18 '11 at 13:54
    
@Revolter, that is an excellent suggestion. –  baraboom Jun 18 '11 at 13:59

2 Answers 2

up vote 5 down vote accepted

Windows will restart automatically for a couple of different reasons:

1) Your software update settings might be configured to automatically install updates, in which case it will reboot to finish them. This support document from Microsoft details how to configure the settings: http://support.microsoft.com/kb/306525

2) When Windows crashes, there is a setting that will automatically restart the system so the user is spared the Blue Screen of Death (BSOD). A quick google turned up this link, http://www.trishtech.com/winxp/disable_automatic_restart.php, but there are many others just like it.

3) As for preventing yourself from rebooting the computer manually, there is a way to set up a "Group Policy" with restrictive security settings. You can learn more here: http://www.addictivetips.com/windows-tips/how-to-disable-remove-shutdown-from-windows-xp-and-vista/, but I would recommend against this as it is not a trivial thing to configure AND why would you want to lock yourself out of your own computer?

Anyway, hope these links help and good luck!

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I think this is because of Windows automatic updates. To disable restart after a windows update follow the instructions from here.

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