What if the Win7 system does not recognize the optical drive?

  
Tip: Modifying the registry is risky, please be cautious.
First step, press Win+R, enter Regedt32.exe, press Enter, open the registry editor;

The second step, find the following key:
HKEY_LOCAL_MACHINE--SYSTEM --CurrentControlSet--Control--Class--{4D36E965-E325-11CE-BFC1-08002BE10318}

The third step, find and delete the UpperFilters and LowerFilters in the box on the right (the box shown below) Looking for UpperFilters and LowerFilters)

Step 4, restart the computer and see if the Windows 7 system can recognize the CD-ROM drive.

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