Vista - "no audio device is installed"

So I come to find that my found that the sound no longer works
in my tray I get a sound icon with an X on it.
When I try opening it it gave me that message.
the only thing I have done recently is using the Hp update
I canceled one of the updates, which was for the nvidia graphics driver
could that have caused the problem? how do I fix it?
the only other thing I've done was going into regional settings and adding Japanese.