How to fix “Windows cannot load USB drivers” error Code 39 or 41 – USB port devices not working (Solved) –

A few days ago, one of my clients noticed that his USB mouse was not working on his laptop. Also, his system cannot recognize any USB device like USB printer or USB storage device. When error code 39 appears, all USB ports appear in the device manager with a yellow triangle with an exclamation mark, and the following error description appears in the device properties: “Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39).

After checking and troubleshooting the USB ports using the instructions in this guide: How to Fix USB Device Not Recognized or USB Not Mounted, his laptop still had the USB Controller problem. After a lot of searching, I finally found the solution below which fixed the USB Controller error 39. *

*Note: The solution has been tested and it works perfectly on Windows 7 OS, but it also works on Windows XP or Vista based computers.


How to solve USB error code 39 (or 41) – USB ports and devices are not working

Step 1. Delete the “UpperFilters” and “LowerFilters” registry keys.

1. Open the registry editor. For this:

  1. Click on “WindowsImage-201_thumb81_thumb + “RClick the ” button to download Running dialog box.
  2. write ““regedit” and press Enter.


2. Go inside the Windows registry (from the left panel) and highlight this key:



3. Look at the right panel:

  • “Click the right mouse button.Advanced filters” key
  • selectDelete“.


4. Do the same (Delete) with “”.Bottom filters” key is found.

6. Close the registry editor.

7. Restart your computer.

8. Now check if your sound card is working. If not, go to step 2.

Step 2. Remove USB Controllers from Device Manager.

1. It’s open Device Manager. For this:

  1. Click on “WindowsImage-201_thumb8_thumb4 + “RClick the ” button to download Running dialog box.
  2. write “devmgmt.msc” and click Enter.


2. In Device Manager, right click on each USB Controller and select “.Delete“. *

*Note: If the USB mouse function is lost during the uninstall process, use the arrow keys on your keyboard to highlight the remaining USB devices and press the “” button at the same time.Ceiling‘ + “F10” buttons to open right click menu to choose from”Delete“.


3. Restart your computer.

4. After your computer restarts, wait for Windows to automatically reinstall the USB Controllers drivers and test your USB ports.

Additional help: If you still have problems with your USB devices, try this guide: How to fix USB device not recognized or USB not mounted problem.

You are done!

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