CD/DVD Rom drive missing from 'My Computer' or 'Computer'

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Often when a user installs any particular software related to media or any codec, the Windows drive of the CD or DVD ROM present in the computer goes missing. This is because the media player codec interferes with filters in the computer hardware. This problem can be solved by locating and deleting the upper filters and the lower filters. Before one goes in search of the missing Windows drive for the DVD ROM or CD ROM, it's advisable to make a data backup. It is important to select the right filter, and it's good practice to delete one at a time to avoid any kind of problem at a later stage.

CD/DVD Rom drive missing from 'My Computer' or 'Computer'


My Matshita-DVD-RAM-UJ-850S cannot be recognized completely. First it has an error code of 39. I wanted to install some applications on my laptop (Sony VAIO VGN-FJ3S/W). Is there some way to get the update drivers for this drive to help activate it? What can I do to solve this problem? Please help.


When the CD/DVD Rom drive is missing from My Computer or Computer, deleting upper and lower filters should solve the problem.
The problem can occur due to installing codecs or other media players which mess with the filters.

It is recommended that you backup your registry before performing these steps.
They appear complicated but really it's just a case of navigating through folder after folder, being careful to select the correct one each time as some can look very similar in name (the numbers on the last entry have others that are almost identical - just make sure it's the right one).

If need be you can Google for "how to backup registry in XP/Vista", whichever applies.
  • Click the Start Button/Windows Orb (as it is known in Vista)
  • For Vista type "regedit" in the search box right at the bottom just above the Start Orb. The top result will be regedit.exe, this is the one you want. Alternatively you can click Run and type "regedit" (without the quotation marks)

NOTE: User Account Control may ask for permission to continue in Vista. Select Continue

This will then load the Registry Editor.
  • In Registry Editor, navigate to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} 

Remember, you're looking for 4D36E965-E325-11CE-BFC1-08002BE10318
There are other entries with only one or two digit differences - so be sure to get the right one!
  • In the right-hand side of the window, locate and click Upper Filters
  • Right-click and select Delete. If you're not confident using the right click, then select the Edit menu, then click Delete
  • In the right-hand side of the window, locate and click Lower Filters
  • Right-click and select Delete. Again, If you're not confident using the right click, then select the Edit menu, then click Delete
  • Exit Registry Editor
  • Now reboot/restart your computer.

Check and you should see your DVD/CD Rom again.

More information here:


Thanks to Liverbird for this tip on the forum.
Jean-François Pillou

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