In device manager your dvd/cd device may have failed. To remove corrupt registry entries follow below: 1 – Start Regedit. 2 – Find keys: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} 3 – Delete all Upperfilters and Lowerfilters keys. 4 – Uninstall device in device manager 5 – Scan for hardware changes in device manager.