I am having trouble with a NEC ND-6650A DVD/CD drive not being recognized on Windows XP. The Device Manager gives me:

Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)

Trying to install the driver gives the following message:

Target NEC ND-6650A is not found correctly

I have found several sites such as



suggesting I delete the LowerFilters and UpperFilters registry values from


Before I make these changes, I would like to learn exactly what these specific settings are doing. (I'm a CompSci major, so I can handle the details :)

I have checked on the manufacturer's website, but I cannot find any documentation of what these entries are doing. (As mentioned here: Windows 7 Registry Settings Documentation)

  • 3
    I'm a CompSci major, so I can handle the details. Ah the arrogance of youth.
    – xdhmoore
    Mar 29, 2018 at 19:11

1 Answer 1


See this page for a brief explanation of filter drivers. In short:

  • Upper filter drivers go between the operating system and the main driver, and lower filter drivers go between the main driver and the hardware.

  • Each of the filter drivers should be present in C:\Windows\System32\Drivers with a .sys extension.

  • You need and should only remove filter drivers that are causing a problem or do not exist on the system, leaving no blank lines and keeping each driver on its own line. Otherwise, as the Microsoft article says, you will have to reinstall programs such as CD burning software and iTunes.

  • Awesome. Very helpful article! I did end up just "blasting away" the entire entries, but I will know in the future how to find the individual values that are causing the problem. I think the problem may have been caused by some zealous use of System Restore. Thank you very much. I would upvote this if I had enough rep.
    – xdhmoore
    Nov 27, 2011 at 22:40
  • 1
    @PleaseStand thanks for including a brief explanation, that link is now dead. Jun 30, 2017 at 14:35
  • 1
    Not as good as a summary, but here it is on Internet Archive: web.archive.org/web/20110623072356/http://djlizard.net/2007/04/…
    – xdhmoore
    Jul 1, 2017 at 23:51

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .