This means Windows doesn't recognize your sound card.
If updating the driver didn't fix the issue, try these steps: 1. Reinstall Realtek Audio Driver acer sound drivers
Click . Windows will search online for an updated version and install it. How to Reinstall a Glitched Driver This means Windows doesn't recognize your sound card
Go to > System > Troubleshoot > Other trouble-shooters . Run the Audio troubleshooter. acer sound drivers