In this guide you can find instructions on how to solve the USB device error 39 (USB ports and devices not working). When you receive the “USB Error 39“ error, then all USB controllers appear with an exclamation point at Device Manager and the full error description is: “Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39).”:

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I can't roll back the driver (its grayed out) and disabling it doesn't fix my problem (though everything seems to run like normal). I've even gone back 2 months as a system restore, to where I know it was working fine, and I still have the same issue. I have a driver problem with SM Bus Controller with the driver not being correctly installed, but how do I find out what are the details I need to upd SM Bus Controller Driver Solved - Windows 10 Forums.

If you want to solve Error 39 on USB, then follow the steps below:

How to fix ‘USB port not working – Error 39’ error in Windows 8, 7 & Vista

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Step 1: Delete invalid “UpperFilters” value from Windows Registry.

• Open Registry Editor: To do that:
  • Simultaneously press “Windows” + “R” keys to open the RUN window.
  • In “RUN” window “Open” box, type: regedit
  • Press Enter.
• At the left pane, press the “+” sign and navigate to this key:

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HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{36FC9E60-C465-11CF-8056-444553540000}

• Look at the right-pane and Delete (right-click > Delete) the “UpperFilters” value.

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• CloseRegistry Editor and restart your computer.
• Check if your USB ports are working. If not, proceed to next Step.

Step 2: Uninstall all USB controllers and devices from Device Manager.

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• Open Device Manager. To do that:
  • Press 'Windows” + “R' keys to open the RUN window.
  • In “RUN” window “Open” box, type: devmgmt.msc
  • Press Enter.
• In Device Manager expand Universal Serial Bus controllers.
• Right-click on every USB controller or device and select Uninstall.

• Restart your computer.
• Wait until Windows re-install all Universal Serial Bus controllers.
• Plug your USB device again.
• Install drivers if needed.

That’s it!

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