Unable to mount the CD/DVD-ROM drive inside a Windows VM

Symptoms :
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• You are unable to see a DVD/CD-ROM drive after mounting
• You are unable to install VMware Tools because the drive is not mountable
• Reinstalling the drivers for the DVD/CD-ROM on the virtual machine does not resolve the issue

Resolution :
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• This issue occurs due to a Microsoft registry problem.  
• To resolve this issue, you must delete the UpperFilters and LowerFilters registry keys of the CD-ROM drive from the registry. 

For more information, see the Microsoft Knowledge Base article 929461.

Notes:
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This article contains steps to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, ensure to follow these steps carefully.
For additional safety, back up the registry before modifying it. For more information, see the Microsoft Knowledge Base article 322756.