The Unknown USB Device (Device Failed Enumeration) error in Windows typically indicates a problem with a USB device or its driver, preventing it from being correctly recognized or initialized by the operating system. This error can happen when Windows is unable to properly "enumerate" (identify and configure) a connected USB device, usually due to a driver issue, a hardware conflict, or a problem with the USB port.

The error appears in Device Manager, usually under the Universal Serial Bus controllers section, and is often accompanied by a yellow warning icon. The specific message is:

• Unknown USB Device (Device Failed Enumeration)

This error can occur with any USB device (e.g., external drives, USB hubs, printers, etc.), and it typically means that the device is not properly installed or isn't functioning correctly due to a driver issue.

Steps to Fix "Unknown USB Device (Device Failed Enumeration)" Error:

1. Restart Your Computer:

• A simple restart can sometimes resolve USB issues, especially if they are caused by temporary system glitches or conflicts.

2. Disconnect and Reconnect the USB Device:

• Unplug the USB device that is causing the issue and reconnect it.
• Try using a different USB port on the computer.
• If it's a USB hub, try plugging the device directly into a port on the computer.

3. Update or Reinstall the USB Driver:

• Open Device Manager: Press Windows + X and select Device Manager.
• Find the Unknown USB Device (Device Failed Enumeration) under Universal Serial Bus controllers.
• Right-click the device and select Uninstall device.
• Restart your computer. Windows will attempt to reinstall the USB drivers automatically upon reboot.
• If Windows doesn't reinstall the driver automatically, you can manually install the latest USB drivers from the manufacturer's website or use Windows Update.

4. Update Your System's USB Drivers:

• Windows Update: Check for any available system updates that may include updated USB drivers.
  • Go to Settings > Update & Security > Windows Update and click Check for updates.
• Manual Driver Installation: You can visit the motherboard or laptop manufacturer’s website (for your computer's chipset) and download the latest USB drivers for your system. These drivers may be listed as part of a chipset driver package (e.g., Intel, AMD).

5. Disable USB Selective Suspend:

The USB Selective Suspend feature in Windows can sometimes cause issues with USB devices. To disable it:

• Open Control Panel and go to Power Options.
• Click on Change plan settings next to your selected power plan.
• Click Change advanced power settings.
• Find the USB settings section, expand it, and set USB selective suspend setting to Disabled.
• Click Apply and OK, then restart your computer.

6. Check for Conflicting Devices:

• In Device Manager, check for any devices with an exclamation mark or error symbols.
• Look for any other devices that might conflict with your USB controller, such as old or improperly installed hardware.
• Right-click on any problematic devices and select Uninstall, then restart the computer.

7. Try a Different USB Device:

• Test the USB port with a different USB device to see if the issue is with the port itself or the specific device.
• If the error persists with other devices, the issue might be with the USB drivers or motherboard.

8. Update or Reinstall the Chipset Drivers:

• If the problem persists, update your chipset drivers, as they control how the USB ports interact with the operating system.
• Visit the manufacturer's website (e.g., Intel, AMD, or your laptop/motherboard brand) and download the latest chipset drivers for your system.

9. Check for Hardware Issues:

• If none of the above steps resolve the problem, there may be a hardware issue with the USB port, the USB device itself, or even the motherboard’s USB controller.
• You can test the device on another computer to see if it works, or try a different USB device in the same port to rule out hardware failure.

10. Reset USB Root Hubs (Advanced Option):

• Open Device Manager.
• Scroll down to Universal Serial Bus controllers and right-click on each USB Root Hub or Generic USB Hub.
• Select Uninstall device, then restart your computer.
• Windows will reinstall the USB hubs after a reboot, which can sometimes resolve driver issues.

Conclusion:

The Unknown USB Device (Device Failed Enumeration) error is often caused by issues with USB drivers, hardware conflicts, or problems with the USB port itself. The steps outlined above should help you troubleshoot and resolve the problem, from restarting and reinstalling drivers to updating your chipset drivers and ensuring no hardware conflicts. If the issue persists, there may be an underlying hardware problem that requires further diagnosis or professional repair.

Let me know if you need more detailed steps on any of the troubleshooting methods!