Hi J. I'm Greg, an installation specialist, 9 year Windows MVP and Independent Advisor, here to help you.
Try uninstalling the existing driver first in Settings > Apps > Apps & Features and Device Manager under Sound drivers, then install the latest driver for your Dell Service Tag (on sticker on PC) from Dell here:
http://www.dell.com/support/home/us/en/19/Produ...
If this isn't enough:
1) Try this checklist:
https://support.microsoft.com/en-in/help/402699...
2) Restore the Windows Audio Service which may have become disabled:
https://www.tenforums.com/tutorials/57567-resto...
3) Right click Volume icon in System Tray, choose Sound Settings, from the Output and Input devices dropdown menus, choose then one(s) affected to see if that helps. If not use the Troubleshoot button nearby.
5) Run the Playing Sound troubleshooter at Start button > Settings>Update & Security>Troubleshoot.
6) Try rolling back the sound drivers in Device Manager reached by right clicking the Start button. Choose Sound controller and other audio devices, then Driver tab, then Roll back if available.
7) If no newer sound drivers then uninstall the one presently installed in Device Manager, reached by right clicking the Start Button. Restart PC to reinstall.
8) Try other and older drivers for your model Sound controller, too. For example, try the next oldest driver in the model's online Support Downloads list. To try all previous drivers installed on your system, in Device Manager choose Sound controller's Driver tab, then Update Driver, then Browse, then Let Me Pick.
9) If this was caused by Windows Updates then you can check which were installed at Settings>Update & Security>Windows Update under Installed Updates, then uninstall them from the link there, and hide with the Hide Updates tool downloaded from here:
http://download.microsoft.com/download/f/2/2/f2...
10) If this was caused by Version 1809 update (which you can confirm at Settings > System > About) then you can roll back Version 1809 in Settings>Update & Security>Recovery and then hide it until it matures using the Hide Updates Tool downloaded from here:
http://download.microsoft.com/download/f/2/2/f2...
11) You can also use System Restore to get before the problem began, then check for Updates with the Hide Update tool and hide them:
http://home.bt.com/tech-gadgets/computing/how-t...
12) Go over this checklist to make sure the install is set up correctly, optimized for best performance, and any needed repairs get done:
http://answers.microsoft.com/en-us/windows/wiki...
Start with Step 4 to turn off Startup freeloaders which can conflict and cause issues, then Step 7 to check for infection the most thorough way, then step 10 to check for damaged System Files. Then continue with the other steps to go over your install most thoroughly.
13) If nothing else helps then run a Repair Install by installing the Media Creation Tool and choosing from it to Upgrade Now. This solves many problems and will also bring it up to the latest version which you need anyway and by the most stable method.
http://windows.microsoft.com/en-us/windows-10/m...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
If you receive a popup asking if this solved your problem please ignore it, as it will remove my ability to help you and others may also not help. Please wait until after the issue is resolved to answer the popup or mark your question answered to help others.
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