How to solve the problem that the win7 system CD-ROM can not be used

I wonder if you have encountered a very strange problem after upgrading to Windows 7: the DVD drive is not recognized by the system, only one in the device manager... The exclamation mark shows a problem with the data signature:

"Windows cannot verify the data signature of this device..." (Code52)

One way is to turn off the digital signature. This allows the drive of the optical drive to operate normally.

On the other hand, this is not a perfect solution. To completely solve the problem that the DVD drive is not recognized by Windows 7, refer to the following methods.

Optional Method 1:

1. Enter regedit in the Start menu and press Enter. Open the Registry Editor

2. Expand the following registration key

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E965-E325-11CE-BFC1-08002BE10318}

3. In the right panel, right click UpperFilters, click delete

4. Click "Yes" to confirm the value deletion

5. Also delete the LowerFilters value. Confirm deletion

6. Exit the Registry Editor and restart

Note: When you delete the above two values, you may lose some features, such as CD recorder. If this happens, you must reinstall the affected program. If the problem persists, you may need to contact the program vendor to see if there is an updated version of this program.

Optional Method 2:

1. Click Start->All Programs->Accessories

2. Right-click Command Prompt->" to Admin Identity Run"

3. Paste the following command and press Enter:

bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS.