I know this isn't exactly a timely response, but it may help other to know that when I ran into this "Optical drive can't be opened in exclusive mode" issue, I went through my system to find what had access to the optical drives and found that Window Media Player had media sharing turned on. Essentially, it was sitting and watching the drives for a disc to be inserted.
On my WMP version 11, I just turned off device sharing completely, but with this version and others, you can probably turn off the sharing of the optical drive alone if you do want to keep music or video sharing turned on. I won't go into the details of turning the various features off or on, but if you go into the Tools -> Options window, you should be able to find it under Library. If not, just dig around and look for sharing.
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