I also have a Canon MF4350d. I tried what you did, but it did not work for me. Called Canon, no help. They referred me to Microsoft. Microsoft suggested I either roll back back to earlier OS, buy new scanner, or pay them $$$ and they would investigate further. I told them they needed to get off their $%&** and offer a fix for this scanner incompatibility issue. They more or less told me they did not care and I hung up on them.
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