Solve Windows 7 does not recognize part of the DVD drive

is the DVD drive is not recognized by the system, in the device manager is just a … exclamation mark shows the data signature has a problem: I do not know if you have encountered a upgrade after upgrading to Windows 7 Very strange problem

“Windows cannot verify the data signature of this device. . . The middle is slightly (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_MACHINE\\SYSTEM\\Current\\ControlSet\\ControlClass{4D36E965-E325-11CE-BFC1-08002BE10318}

3 In the right panel, right click on UpperFilters, click on Delete

4. Click on ”Yes&#> Confirm Value Delete

5. Also delete the LowerFilters value. Confirm Delete

6. Exit the Registry Editor and restart

Note: When you delete the above two values, you may lose some features, such as CD Recorder. It is necessary to 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. In addition, for the problem that the CD drive cannot read the CD, it is necessary to detect the optical drive or the optical disc.

Optional Method 2:

1.Click Start-> All Programs-> Attachments

2. Right-click Command Prompt-> ” to manage members run & rdquo;

3 paste the following command and press Enter:. bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS