Windows7 does not recognize some DVD drive problems

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

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

“Windows cannot verify the data signature for 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. Type regedit in the Start menu and press Enter. Open Registry Editor 2. Expand the following registration key HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E965-E325-11CE-BFC1-08002BE10318} 3. In the right panel, right-click UpperFilters and click Delete. 4. Click & rdquo; Yes & rdquo; Confirm Value Delete 5. Same Remove the value of LowerFilters. Confirm Delete 6. Quit Registry Editor, and then restart

Note: When you delete two numbers above price is likely to lose some features, such as CD recording program. 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 -> Attachment 2. Right-click Command Prompt -> ”Run as Administrator> 3. Paste the following command and back car: bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS