I had the same situation after a recent update. Here's how to fix it:
1.right click on the speaker icon in the bottom right hand corner
2. Select "Troubleshoot"
3. Select speakers
4. Then it will run test sounds; afterwards, select "Bad. Reinstall driver"
5. It will then run the test again; afterwards, select "Bad. Install Microsoft HD driver"
That fixed it!
1.right click on the speaker icon in the bottom right hand corner
2. Select "Troubleshoot"
3. Select speakers
4. Then it will run test sounds; afterwards, select "Bad. Reinstall driver"
5. It will then run the test again; afterwards, select "Bad. Install Microsoft HD driver"
That fixed it!