We have seen steps to disable automatic BlackBerry update. But if you only want to hide the BlackBerry Automatic Update notifications then you can use the customize notification option available as part of Windows 7 for this purpose.
Click the Show hidden icons option on Windows 7 Taskbar and then click the Customize link. Using Customize link we can select what icons appear on Taskbar.
In the Notification Area Icons window, navigate to RIM Auto Update section and set the value for the drop down to Hide icon and notifications. By this way you can hide the BlackBerry Automatic Update notification in a Windows 7 PC.