Windows Update for Windows 7 with SMS 2003

It appears that Windows Update is getting patches from the Internet even though we have SMS 2003. For XP, I had to set group policy - configure Automatic Updates to enabled to have SMS 2003 work. However, for Windows 7 and SCCM, this has to be disabled. Does anyone know how to turn off Windows Updates and still have SMS 2003 able to send down updates?