The reason why the DVD drive cannot be found on Win7

                                                                                                                                                                                         

There are more and more users using the windows
7 system, of course, everyone will encounter various problems in the process of using win7. A common problem with Win7 is that the system prompts that the DVD drive cannot be found. The DVD drive is not recognized by the system. In the device manager, it is just an exclamation mark. The data signature has a problem: "Windows cannot verify the data signature of this device ……" Code52) "To completely solve the win7 system prompts the DVD driver can not find the problem that the DVD drive is not recognized by Windows 7, refer to the depth of Windows 7 Ultimate ghost xp sp3 download the following method. Solve the win7 system prompts the DVD driver can not find an alternative method: 1. Enter regedit in the start menu, 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 and click Delete. 4. Click “Yes  Confirm Value Delete 5. Same Remove the value of LowerFilters. Confirm delete 6. Exit the registry editor, and then restart the computer
company system download tips: 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. Solve the win7 system prompts the DVD driver can not find the optional method two: 1. Click Start -> All Programs -> Attachment 2. Right-click on the command prompt -> “ Run as administrator ” 3. Paste the following command and press Enter: bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS