What if Win7 can't identify the optical drive?

Cause Analysis:
The problem may be caused by an incorrect key in the registry.
The ultimate solution:
Tip: Modify the registry is risky, please be careful.
1. Press Win+R, enter Regedt32.exe, press Enter, open the registry editor;
2. Find the following key values:
HKEY_LOCAL_MACHINE--SYSTEM--CurrentControlSet--Control- -Class--{4D36E965-E325-11CE-BFC1-08002BE10318}
3. Find and delete UpperFilters and LowerFilters in the box on the right (see UpperFilters and LowerFilters in the box)
4. Restart the computer and see Windows. 7 Whether the system can recognize the optical drive.