Vista updated, now my external speakers don't work

Left pc on during the night to finish an update, in the morning it had restarted itself and now the external speakers don't work.


Sound works through headset but not the speakers.


Nothing appears to be muted, i've tried to update drivers for the "audio devices" through control panel but returns
with "drivers appear to be up to date"


Vista Ultimate 64
i7 quad core
6gb ram
ati radeon hd4870
ATI HD audio device
realtek HD audio
-not a laptop-





I've restarted the computer, checked the updates the device drivers both the ATI/realtek ones and they came back saying already up to date.

I usually run the computer with both external speakers and a headset plugged in, when using the headset i simply turn down the speakers. I have unplugged both to see if it would change anything but still the external speakers don't make a sound.

I've noticed that when i click on the volume mixer, there is some sort of odd graphical glitch where the text on screen is random and the slider icons bugged.

Apologizes if this is all a bit vague, but any idea's how to fix this?

Welcome
First fix the problem by using System restore from the time prior to the update, then post for more help.
We will need to know which updates were uninstalled.