Win32 system DVD drive unrecognized solution

Many friends will encounter a problem after upgrading to Windows 7: DVD drive can not be recognized by the system, the device manager is just an exclamation point, showing data signature problem: "Windows can not Verify the data signature for this device."
One way is to turn off the digital signature, so that the drive of the optical drive can run normally.
In fact, 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.
Method 1:
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 on UpperFilters, click delete;
4. Click "Yes" confirm the value deletion;
5. Also delete the LowerFilters value, confirm the deletion;
6. Exit the registry editor, and then restart.



Please 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.
Method 2:
1. Click Start -> All Programs -> Attachments;
2. Right-click Command Prompt -> Run as Administrator";
3. Paste Press the following command and press Enter: bcdedit/setloadoptionsDDISABLE_INTEGRITY_CHECKS.