If you disable something in msconfig every-time you start the computer you will get a window telling you that you are using 'selective diagnostic startup'. If you tick the box in the left hand corner of the window, it will not show that warning window again. It is only telling you that you have changed something in the start up.
To go back to normal run msconfig again, and in startup select enable all click apply, and then you will have to reboot. The only problem there is all the programs you do not want to run when you start will re-start again.