Windows 8.1 can't see io4 any more

Until recently, I was recording fine from the io4 into Sony Acid Studio. Now, the audio from Acid doesn't go through the io4, and the io4 doesn't send audio back. When I go into Control Panel > Sound, I don't see io4 listed in either Playback or Recording. I've tried reconnecting the io4 and using a different MIDI cable. How can I force Windows to recognise it again? I'm using Windows 8.1. Thank you!
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