Preface:
Windows comes with a built-in feature to keep your computer always up to date with windowsupdate by including a program called Automatic Updates. Personally, I want to know when I'm updating my server and not let some program do it for me, so in this case we would disable it.

Method:
Click the Start button, then right click My Computer and click Propertise
Now, go to the Automatic Updates tab, and click the checkbox (to de-select) "Keep my computer up to date..." and click Apply then OK

Hehehe,

I have already disabled it... Nahi tu window block ho jati hay

But on windows 7 have I have enabled automatic update... because I have it's original beta version...