One thing which annoy me a lot is: Let's say a person is going to scan his computer. He open the Start Center, and go to update, the new window will pop up (replacing your current window). But now he have to close his current window, and open the Start Center window again, which is quite a cumbersome way to scan a computer. It should be able to instantly go back to the Start Center. I know it's possible to go to Associated Tasks - Start Center in the menu bar, but that opens a new window. It should be like everything happened in one window. Examples of competitors who's doing it like you are doing are...... none?? Every competitor have the option to update, scan, etc in the same window.
Just a thought..