How to Delete the UpperFilters and LowerFilters Registry Values
Removing the UpperFilters and LowerFilters values in the Windows Registry is easy and should take less than 10 minutes:
When to Delete the UpperFilters and LowerFilters Registry Values
Removing the UpperFilters and LowerFilters registry values is a likely solution to a number of Device Manager error codes. For example, let’s say your DVD drive is showing a Code 39 error in Device Manager. According to the list above, this is the GUID for CD/DVD devices: Once you know this GUID, you can continue with Step 6. If you’ve completed these steps due to a Device Manager error code, you can view the device’s status to see if the error code is gone. If you’re here because of a missing DVD or CD drive, check This PC, Computer, or My Computer, and see if your drive has reappeared. These values, sometimes incorrectly called “upper and lower filters,” might exist for several device classes in the registry, but those values in the DVD/CD-ROM Drives class tend to corrupt and cause problems most often. A few of the more common Device Manager error codes that are frequently caused by UpperFilters and LowerFilters issues include Code 19, Code 31, Code 32, Code 37, Code 39, and Code 41.
More Help With the UpperFilters and LowerFilters Registry Values
If you still have a yellow exclamation mark in Device Manager even after following the above steps, head back to our troubleshooting information for your error code and look into some other ideas. Most Device Manager error codes have several possible solutions. 4D36-E96B-E325-11CE-BFC1-0800-2BE1-0318.
