- From what to what did you upgrade?
- Where did you get the drivers for the new OS from?
- What other versions did you try?
- Do the native Windows drivers work correctly (those are different from the more powerful version you downloaded, most likely).

When I installed Windows 10 on my MSI motherboard, sound worked immediately, but the driver I downloaded later from the MSI site had more options.

The common work around in such cases: a simple and cheap USB sound'card'. Be sure it comes with drivers for your new OS.