Is AtherosSvc Safe?

My research indicates that it is a Bluetooth driver for motherboards with built-in Bluetooth. However, most sites indicate that it should be found at %ProgramFiles%\Bluetooth Suite\adminservice.exe. The fact that yours is in C:\Windows\System32 might mean that it is not a legitimate version.

If you are not using any Bluetooth features, it won't hurt anything to disable the service.