Then they need to turn around at once! Leaving users in the dark about what`s going on makes things more difficult for them. Taking away choices limits the use of the software to the point where it eventually becomes unusable.
Good design, clarity, good documentation and letting the user know what choices there are are required when you want to achieve ease of use.
I don't think the installer is as bad as most people on this list are complaining about; it's certainly not leaving any users in the dark. A large majority of the information from the older installer is still there, it's just up to the user to seek it out.
In essence the installer went from a hardcore presentational format to a more laid back format - a shift every OS has consciously made in the last decade.