go to Control Panel>Administrative Tools>Computer Management>System Tools>Device Manager>Sound/Audio. right click on the program that runs your audio (most use AMD Catalyst but could be another) and click scan for hardware changes. if that doesn't work then on Sound/Audio, right click the audio program again, down to Properties>Drivers then update or roll back drivers. let me know if either those work. you might have to download a catalyst program if not.
if you hit the windows button + pause then select Device Manager. click the arrow next to Sound, Audio & Game Controllers and it should tell you in there.
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It's an AMD i believe. click the windows button and in the search box type system information or pc info.