You can download it manually. http://www.catalog.update.microsoft.com, and search for "C-Media Inc. - Audio Device - USB Audio Class 1.0 and 2.0 DAC Device Driver". Current version is 10.0.12.9 and shows up as "C-MEDIA Inc. - Media - 11/29/2016 12:00:00 AM - 10.0.12.9".
I'm thinking the drivers for the USB controller itself is hosed. There might be missing chipset controller drivers missing as well. It may not appear so in Device Manager, as a default Windows driver could be installed instead of the correct mfgr drivers.
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