Audio does not work after an update in Windows 8

I use a laptop HP Folio 9470 m... Last week some update was installed to win 8 and after that my audio is not working properly. Every time when I need to play a song or a movie, or watch something on the Internet, I need first logout, then after logging in first, I need to open the drive. Other wise the audio does not work... Whenever I check to test the speakers, it shows its used by another application, but there is no application by using the audio device. I checked all the drivers, and everything is right in there... But I don't understand that either the app using the audio device in the background... I even reconfigured my system, suspecting it was a virus. But after installing the operating system first two days, that it worked fine, and then a few updates got installed, now return to the box starting... I can see the updates which has installed, but cannot identify the one which may cause this disorder...

One, any help is deeply appreciated.

Thanks in advance...

AG.

07/11/14 - the problem is caused by the updates of security KB2964736 and KB2965788, which has turned off the sound from the speakers and output microphone of my VAIO laptop, as well as all the features in iTunes.

I was able to determine that, because now, I manually install updates after the last problems caused by automatic updates. Having discovered this problem, I did a system restore to before the updates to get my sound back, then I manually created a restore point individual for each update before installing. It was a frustrating and time-consuming process, but I could locate the defective updates that I've now hidden so that they will not download on my laptop.

07/12/14 as a result of writing the earlier yesterday, all sounds had again been disabled when I started my laptop this morning. I did another system restore before installing updates security yesterday (KB2965788, KB2939576, KB2964736, KB2957189) AND my sound back. I've now updated iTunes with the latest version in the hope that this stops the residual fault caused by security updates and I will keep you informed.

Tags: Windows

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