So I'm going with GENERIC ADVICE.
1. Use system restore to the day before yesterday.
2. NEVER ACCEPT DRIVERS from Microsoft unless you are ready to deal with the failures.
3. Look in the BIOS settings for the enable/disable of on board sound. A few reply they didn't change it which is nice to know but still something we must check.
Sorry for the generic answers but no model number to work with. And don't panic if the audio card is gone and failed. There are 2 dollar USB sound devices to take over for a cheap fix.
Computer (Dell)has been working fine then yesterday I went to watch a video and it played fine but no voice. So I checked to see if the volume might have gotten on mute but it was on it's regular setting. The icon is no longer in the tray as it usually is.
Then check Sounds & Devices and everything is grayed out staying no audio device can be found. I checked everything else and update all the drivers but still no sound.
How could it suddenly disappear.
Any help, as always is greatly appreciated.