Vad man kan hitta om man bara letar lite ;)
you can also edit the registry to disable/enable Windows Update on a per user basis:
1. Start regedit.exe on the machine where you want to disable Windows Update.
2. Go to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer.
3. From the Edit menu, select New, DWORD value.
4. Enter a name of NoWindowsUpdate, and press Enter.
5. Double-click NoWindowsUpdate, and set it to 1 (0 = enable).
6. Close regedit.
You don't need to reboot. If the user tries to start Windows Update, the system will display the following error message:
Windows Update was disabled by your system Administrator.