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Solve : Suddenly: sound error; no sound device?

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Hello:

Suddenly today I got this message when I tried to play a music FILE.

Windows Media Player cannot play the file because there is a problem with your sound device. There may not be a sound device installed on your computer, it may be in use by another program, or it may not be functioning properly.

Then I realized that none of my sound players would emit any sounds. And, instead of the "start up" sounds coming from the speakers and headphones, there is just a little beep from the computer itself.
 When I go to Control Panel and CLICK on Sounds and AUDIO Devices, it says No Audio Device.

 I don't know what made this happen or how to undo it. I have a webinar conference today and need to have the audio for it.  Also, I can say that I did a complete virus and malware check (AVG) and there was nothing found.

 I think that when I signed up for the webinar (Cisco Webex) a file was uploaded that nulled my sound device. At any rate, I would like to FIX it. Would a "system restore" do? I don't know how to do that but I've heard about it.

  Unfortunately I don't know what my "sound device" was originally. I think it came with the Mother Board and stuff.

Thanks for any help, as quick as you can.

In peace
Dr. D'EliaLook in Device Manager - any errors?Nvidia WDM Video Capture Universal has a yellow explanation point beside it. Does that mean something?First thing you want to do is download and install the LATEST driver for that device.


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