Hi.
The problem has been listed in the wrong category and with no model number.
If we are talking about a laptop, you should download drivers using computer model, and getting the file from laptop manufacturer website.
Same on a desktop. If the desktop is a no-brand, then you must download the file from motherboard manufacturer website.
Drivers available from Realtek support may work most of the times, but some computer will need the manufacturer customized version of Realtek files.
Here the generic download page:
Downloads - RealtekThe drivers for 5548 are included in the
High Definition Audio Codecs (Software) package. Download and install it. If it does not work, get drivers from computer manufacturer website.
Regards.
Ginko.