For some reason I cannot access my CD Rom to play music. The above messages come up.

Any suggestions.

It is a 52Xmax device. I checked the Device Manager etc etc and all seems OK. But I also see Mitsumi with a yellow exclamation mark. Is this important?

The yellow indicates a failure.

Right click the device & try to update the driver or else try here:

http://www.mitsumi.com/enduser/1_drivers.html