Camera and Audio will not work on Windows 10 (among other things)

[Windows 10]

All day now I've had this excruciating problem with my computer's audio. It will connect to my headphones/ speaker, but it will not play sound. Trying to test the sound in "Manage Audio Devices" gives the error "Failed to play test tone". On top of that, I realized that my camera also does not work, saying it needs permission, even though it already has it. I've searched around all day and I'm guessing there's some driver or permission issue, maybe because of a minor update from yesterday on April 4th? I can't roll it back though because I used disk cleanup last night. sfc /scannow says there

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