Stop the Annoying Restart Now - Restart Later popup

I've been annoyed by this Windows Automatic Update popup on my WinXP box. I'm trying to get rid of this. When I google this keyword - I end up browsing and reading some suggestions to messed up with my Windows Registry.
One suggestion that i like is this - a very simple one.
Steps:
1) Click the start button
2) Select and click the "Run"
3) On the run dialog box, type the CMD to open the WinXP DOS shell.
4) On the command prompt (the one with c:\Documents and Settings\whoareyou>), type this sc stop wuauserv

Nice one. I've tried and tested this.

The Windows Update icon on the system tray will disappear. No more annoying restart popup also will appear after this.