|"I am very pissed at this". Why are you pissed? You control the settings. If you didn't want to use auto updater then you should have changed the settings.|
"My computer is set to Automatic/Express Update"
That said, you should be able to uninstall that update if you really want to.
What programs don't work with SP3?
Go to control panel> add/remove programs. Make sure the box to show updates is checked and look for SP3. Then simply uninstall.