Good day! I am Independent Advisor Paul R. and also a Microsoft/Windows user like you and I am glad to be able to provide assistance to you today. I understand that you are looking for the installer of the Realtek Audio Drivers for your machine.
You can check for it by doing the following.
Method 1:
You can go the manufacturer's website and look for the driver there for your specific model of your machine.
https://www.dell.com/support/home/xx-xx
Method 2:
Right click the Start Menu then go to Device Manager. Once you’re there, navigate down to “Sound, video and game controllers,” find the device that needs to be updated, right click it and select “Install Driver.”
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
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Regards,
Paul R.