How to solve the problem that Windows 7 can't identify the CD-ROM

I don't know if you have encountered a very strange problem after upgrading to Windows7: the DVD drive is not recognized by the system, it is only one in the device manager... The exclamation mark shows the data signature. Problem: "Windows cannot verify the data signature for this device. . . In the middle (Code52), there is a way to turn off the digital signature, so that the driver of the optical drive can run normally. On the other hand this is not a perfect solution. To completely solve the problem that the DVD drive is not recognized by Windows7.
Operation Steps
Enter regedit in the start menu and press Enter. Open the Registry Editor.
Expand the following registration key.
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E965-E325-11CE-BFC1-08002BE10318}
In the right panel, right-click UpperFilters and click Delete.
Click & rdquo; is & rdquo; confirm the value to delete.
Also delete the value of LowerFilters. confirm deletion.
Exit the Registry Editor and restart.