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The events tab in device manager shows a list stating 'device installed' over and over. Update history states the audio device update was successful.

I've also tried doing a system restore to before the update but this also failed with the message 'access denied'.

Windows found driver software for your device but encountered an error while attempting to install it. Windows encountered a problem installing the driver software for your device. I have tried uninstalling and reinstalling many many times, including downloading the driver from the Lenovo website and using the driver from the D drive, always with the same error: There is an exclamation mark next to the device in device manager and an error code for the driver that states 'Reinstall the drivers for this device. Installed windows updates earlier today, including an optional one for the conexant audio device, and now there is no sound. I have a Lenovo G510 running windows 8.1 64 bit, bought about 6 weeks ago. Hi, sorry if I've started this thread in the wrong place - I've never needed to request help with a computer problem before.