I am suferring from the same problem like many others where my CD/DVD drive has suddenly disappeared. I have also tried to follow the microsoft steps to remove the upper and lower filters, but I couldnt find it anywhere listed in the regedit. Now I am out of guess here what am I suppose to do here and which windows update has cause this issue. I am not even able to use the System Restore function, because i remembered that previously when i did that it kept reinstalling the Windows Updates.
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