Hello markshort,
I am sorry to know about the issue.
Please try first of all to connect via Intel® WiDi. Disable the firewall or reset the adapter so your computer will find the adapter.
When you are able to connect Intel® WiDi you will see in device manager the Intel® WiDi Audio Device. Uninstall it but DO NOT fill the box “Delete the driver software for this device”.
Just to make sure, do the same for the other audio devices, disconnect from Intel® WiDi and restart your system.
At the moment you reconnect with Intel® WiDi, Windows* will install the driver automatically with the default settings.
Let me know how it goes.