I had a similar problem with a microsoft wireless keyboard. Tried all manner of fixes including updating a HID Serv DLL file, none of it worked (either mute or volume would work but not both). Eventually I stopped using the single USB connector to connect the wireless transmitter unit to the PC. Instead I connected the wireless sender unit to the PC via the Purple PS2 connector (keyboard) and via a Green USB - PS2 adapter (mouse). Don't ask me why but all the buttons started working straight away.
Hope this helps
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