Audio hardware no longer found

Yesterday, I installed iobit malware defense, and afterward started getting errors when I tried to open several programs. I removed it using Revo Unistaller. It didn't solve my issues, so I tried to do a system restore to the previous day;s checkpoint - that system restore failed, but afterward, my audio had quit working. Now, it says in the device properties that the drivers have loaded but the hardware cannot be found. (Error 41)

I checked in services.msc and Windows Audio is automatic and started. I also uninstalled the drivers and installed new ones. Still nothing.

Any suggestions?