G510 - conexant audio driver update won't install - no sound

I have a Lenovo G510 running windows 8.1 64 bit, bought about 6 weeks ago. Installed windows updates on 18 August, including an optional driver update for the Conexant SmartAudio HD, and now there is no sound.
There is an exclamation mark next to the device in device manager and an error code for the driver that (until today) states 'Reinstall the drivers for this device. (Code 18)'. 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, with the same error:
Windows encountered a problem installing the driver software for your device.
Windows found driver software for your device but encountered an error while attempting to install it.
Conexant SmartAudio HD
Reinstall the drivers for this device. (Code 18)
I also tried doing a system restore to before the update but this failed with the message 'access denied'. After spending hours trying to find a fix I discovered that the driver update in question is still listed in windows update (now as 'important'). So I've downloaded and installed and restarted several times but still with the same error message, and the update is still listed in windows update. Update history states the audio device update was successful - every time I've downloaded and installed it - however it is not listed in 'installed updates'. I've also tried uninstalling and reinstalling all the other updates I originally installed on the 18 August.
Today, 22 August I tried uninstalling and reinstalling again and now the error message has changed to:
Windows encountered a problem installing the driver software for your device.
Windows found driver software for your device but encountered an error while attempting to install it.
Conexant SmartAudio HD
This device is not configured correctly. (Code 1)
The events tab in device manager shows a list stating 'device installed' over and over. The information for the most recent event is as follows:
Driver Management concluded the process to install driver g13plmwa.inf_amd64_007bf12cd0f50a21\g13plmwa.inf for Device Instance ID HDAUDIO\FUNC_01&VEN_14F1&DEV_5115&SUBSYS_17AAC041&REV_1001\4&2426718C&0&0001 with the following status: 0x0.
I don't really know how to read all the info in the details tab but the capabilities property has a value of 00000000 which doesn't sound promising to me!
Status property reads:
01802400
DN_HAS_PROBLEM
DN_DISABLEABLE
DN_NT_ENUMERATOR
DN_NT_DRIVER
Config flags:
00000020
CONFIGFLAG_REINSTALL
Can post more from the details tab if that helps - I'm no techie so don't really know which bits of info are important. Would really appreciate some help here, I've searched and searched for a fix and posted the problem on a couple of other forums with no joy and I'm getting really frustrated with having no **bleep** sound!

Well it turns out that my problem was entirely due to the firewall (ZoneAlarm) I'm running blocking the installation. All I had to do was temporarily disable it (making sure you also disconnect from the internet to avoid any nasties getting through) and reinstall the driver.
Hope that solves your problem too, because I found both Lenovo and Microsoft support to be utterly useless on this. All they could suggest was what I had tried already, and then told me to do a factory reset. Glad I didn't listen and asked a friend who works in IT instead!

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