Even when you disable the Windows Automatic Updates in security center, Windows XP prompts you with a warning dialog every time you boot up.
This will disable that warning dialog box.
Add or edit the following registry entry.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
Data Type: DWORD
Value Name: UpdatesDisableNotify
Value: 1
The machine would need a reboot for this change to take effect.
