I was getting help from microsoft about a game lagging and they looked at my system info and said i need to update my video and sound card. I updated my video card and when i rebooted it said there was no audio device and no sound works. I rolled back the driver and it still doesn't work. The only other thing i did was intalled a audio codec- ac3 digital.
In the device manager, under sounds, it says all devices are working.
I would try uninstalling all of the audio drivers, rebooting, and reinstalling them. I would try reinstalling the drivers from the original cd, then updating them. At least then you could make another rollback point that you know works.
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