Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

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

http://www.computing.net/answers/hardware/cant-install-dvd-rrw-driver/60310.html

http://support.microsoft.com/kb/894730

suggesting I delete the LowerFilters and UpperFilters registry values from

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

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)

share|improve this question
add comment

1 Answer

up vote 2 down vote accepted

See http://djlizard.net/2007/04/30/230/ 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.

share|improve this answer
    
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 '11 at 22:40
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.