Although I'm no expert, I think I read somewhere (maybe here at the Renderosity forums) that in order for the updates to take effect, the computer must be restarted, and when you uninstall the offensive update, you must restart your computer immediately after that. At least that last part has been posted by several here and elsewhere. I also read that the update reinstalls unless you download that update hide thingy mentioned earlier in this thread, and run it to hide the offensive update(s). Doing that supposedly ensures that the update won't reinstall on your machine.