Ok the error is you can’t change it back to normal startup. It keeps going back to selective startup.
Make sure your account is an admin. If not an admin, change it to admin. If your account is standard user it will not let you change the normal startup. If your account is now admin, boot to safe mode. Run msconfig again then change it to normal startup. Make sure everything is selected or all check boxes marked in Services tab and make sure no check mark in the boot tab. This should fix it.