You will need to go to your PC manufacturers website, typically on the homepage there is a search box, input your computer model in the search box to pull all info on your PC.
Mine for example would be "www.hp.com" search for "ProBook 4720s", select my laptop "HP Probook 4720s EnergyStar", "Software and Driver Downloads" link, now selecting my OS (Operating System), now there is a list of all the drivers that come with the laptop, select the audio driver (there are two that are by the same manufacturer, theoretically either should work but in the case the on I download does not I will download the other.)
If when you finally get a list of audio drivers pulled up and you have more than one company (RealTek, Soundblaster, IDT) you should be able to hover your mouse pointer over the speaker in the system tray and it should show you which company you need, if not right click the speaker select "Open Volume Mixer" a window should appear in the top lefthand corner there should be a "devices" button select that to see which driver you will need to download.
This seems like a long process but it is quicker and more reliable than letting Windows try to find the latest driver in their database.
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