Proceed through the installer which will uninstall the old driver and reinstall a new one.
Click "Install" to install the new driver.Click "Yes" on the User Account Control window to allow the application to make changes to your device.Find and download the Realtek High Definition Audio Driver.This can be found under the flap on the bottom of the laptop. Enter the Service Tag for your Dell laptop.Some Dell laptops, particularly after some windows updates, may need a driver update to active the headphone port or fix "No Audio Output Device Is Installed" error showing when trying to turn on or increase the volume.
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