Windows 7 Not Detecting CD / DVD ROM Drive

Some Windows 7 users have reported issues lately where Windows 7 is not detecting their DVD Drive after they have installed Windows.
In most of these cases there are two things users can do to attempt to fix the problem.
The first fix involves removing two registry entries referencing the DVD Rom Drive. These two entries can be found in the following location.
Click the Start Menu > and in the “FIND” or “RUN’ field type “REGEDIT”.
In the Registry Editor go to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\

Once you have found this key, look in the right hand pane and remove the “UpperFilters” and “LowerFilters” key.
(Do not remove UpperFilters.bak and LowerFilters.bak)
If this does not correct the issue for you, other users have reported that renaming the Drive “Letter” has resolved the issue for them.
To rename the Drive letter right click on “Computer” and select “Manage”. Under the “Manage” window look for “Disk Management”



Under Disk Management right click on the white bar next to your optical Drive and on the menu select “Change Drive Letter”. Follow the prompt in the new window and it should take you to a drop down menu that will allow you to assign a new drive letter for your DVD Rom.
Once you have renamed the drive letter check under “My Computer” or “Explorer” to see if the drive is now showing. If it is you can repeat the process to change the drive letter back to its original and it should still be detected by Windows 7.
If the above methods fail try rebooting the system after you have made the changes outline above and see if this corrects the issue.