How to do win7 optical drive 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. . . 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_MACHINESYSTEMCurrentControlSetControlClass{4D36E965-E325-11CE-BFC1-08002BE10318}
3. In the right panel, right-click UpperFilters and click Delete
4. Click & rdquo; Yes & rdquo; Confirm the value to delete
5. Also delete the LowerFilters value. Confirm delete
6. Exit the registry editor, and then 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 on Command Prompt - & rdquo; Run as Administrator ”
3. Paste the following command and back Car:
bcdedit/setloadoptionsDDISABLE_INTEGRITY_CHECKS.