Follow the install to the driver. After you restart your computer it will show that CNMDRV.DLL is needed to work properly.
Uninstall completely, but when it asks do you want to uninstall extentions, click "no to all." Reinstall the driver and then it will pick up the CNMDRV.DLL since you left it from the first install.
Here is the URL I found this driver on and other Canon multipass drivers
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