How to disable auto reboot in windows XP?

In order to configure no auto reboot settings for windows XP Professional and Home your windows must have service pack 2 installed.

But the to remove auto reboot for windows XP home and Professional are different.

For Windows XP Professional:

• Open Start >> Run and type gpedit.msc (group policy editor) and press Enter
  
  
• Navigate to the following path
  
  
  Local Computer Policy\Computer Configuration\Administrative Templates\ Windows Components\Windows Update
  
  
  
• Double click “No auto-restart for schedule Automatic Updates installations” and select to enable this setting.
  
  
• Restart windows.

For Windows XP Home Edition:

1. Procedure for windows XP Home edition is quite different as it doesn’t have group policy editor.
   
   
2. Open Start >>Run and type regedit (registry editor )
   
   
3. Navigate to the following path[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]
   
   
4. Locate the following keys:
   
   “RebootRelaunchTimeoutEnabled” and “NoAutoRebootWithLoggedOnUsers” and set their values as 0 and 1
   
   
5. f these registry key doesn’t exist create them with type as dword values in this registry location.
   
   
6. Exit registry and restart.

Note: Whenever modifying any keys in the Registry, be sure to make a backup of the entire Registry in case something goes wrong.