While I do not have an IR blaster equipped on the DH77EB board I'm using, I did install the Nuvoton driver to get rid of a driver not loaded exclamation mark in Device Manager. I found that even if the CIR option is disabled in BIOS, a Consumer IR Device will still show up under System Devices:
I tried enabling CIR in BIOS to see what changes, if any, would occur in Device Manager. I found two new entries were added to the Human Interfaces Devices group a MS eHome Infrared Transmitter and the Nuvoton CIR W836x7HG Device Driver:
The only thing that I could think of that might interfere with the driver being able to load is having the parallel port enabled. There's a note about this in the BIOS warning that CIR won't work if the parallel port is left enabled.