Ok here goes... my understanding is that is you delete the microsoft update KB2533623
To remove this KB2533623 Windows Update, follow the steps below:
- Click "Start > Control Panel > Programs and Features".
- Click the "View installed updates" link on the left side of the window.
- Locate the "Update for Windows Vista for x64-based Systems (KB2533623)" update.
- Select the KB2533623 update and then click the "Uninstall" button.
- Once the update has been removed, restart the computer.
This has worked for me, BUT the upgrade does load everytime I restart so remember to disable automatic updates OR delete KB2533623 everytime.