DVD/CD-ROM drives error 39

Thank you so much for your answer. Someone in a previous years has asked the same question and he was given an advice before proceeding with removing the keys you mentioned, to make a back up of the registry. Should I do a back up first and if yes, how to do it? Thanks,

Hello Marianak,

In most cases, a Code 39 error is caused by either a missing driver for that particular piece of hardware or by a Windows Registry issue. While less common, a Code 39 error can also be caused by a corrupt driver or driver related file. There are few troubleshooting steps that I would suggest which would help us in fixing the issue.

1. Update the BIOS to the latest version.
An out of date BIOS can cause the issue.
Visit the Dell Drivers and Downloads website to get the update BIOS to your computer. Enter the system service tag, select the tab for drivers and download and then choose the operating system. Under BIOS, you would get the latest version.  

**NOTE: Few things to ensure before updating the Bios is, the Ac Adapter should be plugged in and the battery should have minimum of 15% charge. No other external peripherals should be connected to the computer. Please ensure that the Bios update should not be interrupted else it would damage the motherboard. 

2. Delete the UpperFilters and LowerFilters registry values. A common cause of Code 39 errors is the corruption of two specific registry values in the DVD/CD-ROM Drive Class registry key. 

**NOTE: Be careful while working with the registry editor because changes done to the registry using the Registry Editor are irreversible and mistakes can leave you with more problems than when you started. Therefore, it is recommended that you make a backup of the registry before proceeding with the changes.  

3. Update the firmware for the optical drive. Visit the Dell Drivers and Downloads. Enter the system service tag, select the tab for drivers and download and then choose the operating system and update the firmware for optical drive. Restart the computer and check the functionality.

Please try the steps and write back with results.

Hi MarianaK,

It is very important to make a backup of the Registry because changes done to the registry using the Registry Editor are irreversible and mistakes can leave you with more problems than when you started. Therefore, it is recommended that you make a backup of the registry before proceeding with the changes.  

Please follow the articles on how to back up the Registry:
1. Back up the registry.
2. How To Backup the Registry in Windows 7.

Please write back for further questions.