Stop Windows 7 Restarting Automatically

1. 1^st pleas press window logo + r and type c:\Windows\System32 

2. Press ok  and open below Window

Find regedt32.exe copy file and past on same location and  make it to regedt32.bak

Then  press window logo + r and type regedit as below picture.

 











Click on ok run window and Open Registry Windows as below 

Then find key for registry below

HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows

Create a key called WindowsUpdate\AU, below Picture

Then create a new value called NoAutoRebootWithLoggedOnUsers

And give it value 1. Now the PC won’restart after an update as long as you are logged on to your computer.