no audio Cubase le ai 7 with windows 10

I was forced to install Windows 10 on my computer (original and activated windows) and now when I work with cubase le ai 7 (also original and activated), the sound won’t come out through the speakers nor the headphones unless I connect my external steinberg audio interface. HOw can I fix that?
It used to work before the windows update both with the computer’s inboard audio interface AND the external Steinberg interface. Now the program runs but no audio can’t be heard when using the computer soundcard.