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Error code 43 is a common Windows Device Manager error that indicates Windows has stopped a hardware device because the device reported a problem. It can affect graphics cards, USB devices, Bluetooth adapters, network adapters, external drives, and other hardware components. When the error occurs, Device Manager usually displays the affected device with a warning icon and shows a message such as, “Windows has stopped this device because it has reported problems. (Code 43).”

A Windows laptop shows error code 43


In many cases, error code 43 is related to a faulty or incompatible driver, a temporary hardware communication problem, outdated Windows components, or a physical issue with the device. The exact solution depends on the hardware involved and the version of Windows you are using. The following guide explains practical ways to troubleshoot error code 43, with separate instructions for Windows 11 and Windows 10.

What Does Error Code 43 Mean?

Windows uses Device Manager to monitor connected hardware and its drivers. If a device reports that something has gone wrong, Windows may stop the device to prevent further problems. Device Manager then assigns error code 43 to indicate that the hardware has encountered an issue that Windows cannot automatically resolve.

For example, a graphics card affected by error code 43 may stop displaying properly, while a USB device may disappear from File Explorer or repeatedly disconnect. In some situations, restarting the computer is enough to restore the device. However, persistent error code 43 usually requires additional troubleshooting.

Common Causes of Error Code 43

  • Corrupted, outdated, or incompatible device drivers
  • A recent driver or Windows update causing compatibility problems
  • Temporary communication problems between Windows and the hardware
  • Improperly connected USB or external hardware
  • Power-management problems
  • Conflicts between hardware devices or drivers
  • Damaged system files
  • Defective or failing hardware

How to Fix Error Code 43 on Windows 11

If you are using Windows 11, start with the simpler solutions before making driver or system changes. The steps below progress from basic hardware checks to more advanced troubleshooting.

1. Restart the Windows 11 Computer

  • Save your work and close running applications.
  • Open the Start menu.
  • Select the Power button.
  • Choose Restart.
  • After Windows 11 starts again, check whether the device works normally.

A restart can clear temporary driver or hardware communication problems. If error code 43 appears again, continue with the next method.

2. Check the Hardware Connection

If the affected device is external, inspect its physical connection. A loose USB cable, damaged connector, or insufficient power supply can cause Windows to report a device problem.

  • Disconnect the affected device from the computer.
  • Inspect the cable and connector for visible damage.
  • Reconnect the device securely.
  • If possible, connect it to another USB port.
  • Avoid using an unpowered USB hub while testing.
  • Check Device Manager again for error code 43.

3. Update the Device Driver

A problematic driver is one of the most common reasons for error code 43. Windows 11 can search for a newer driver automatically, while the hardware manufacturer's website may provide a more specific version.

  • Right-click the Start button and select Device Manager.
  • Find the device showing the warning icon.
  • Right-click the device and select Update driver.
  • Choose Search automatically for drivers.
  • Install an available driver and restart the computer.

4. Roll Back or Reinstall the Driver

If error code 43 started immediately after a driver update, rolling the driver back may resolve the problem. If rollback is unavailable, reinstalling the driver can help repair corrupted driver files.

  • Open Device Manager.
  • Right-click the affected device and select Properties.
  • Open the Driver tab.
  • Select Roll Back Driver if the option is available.
  • If rollback is unavailable, select Uninstall Device.
  • Restart Windows 11 and allow Windows to detect the hardware again.

5. Install Windows 11 Updates

Windows updates can contain driver improvements, bug fixes, and compatibility updates. Open Settings > Windows Update, check for available updates, install them, and restart the computer. Then check whether Device Manager still reports code 43.

How to Fix Error Code 43 on Windows 10

The troubleshooting principles are similar on Windows 10, but some menu names and navigation paths are different. Follow the Windows 10 steps below if the affected computer runs Windows 10.

1. Restart and Reconnect the Device

  • Click the Start button.
  • Select Power and then Restart.
  • After restarting, disconnect the affected external device if applicable.
  • Reconnect it securely to another compatible port if possible.
  • Check whether the warning icon has disappeared from Device Manager.

2. Run Windows Update

Keeping Windows 10 updated can resolve compatibility problems affecting hardware and drivers.

  • Open Settings from the Start menu.
  • Select Update & Security.
  • Click Windows Update.
  • Select Check for updates.
  • Install available updates and restart the computer.

3. Update the Problematic Driver

  • Right-click the Start button.
  • Select Device Manager.
  • Locate the device displaying error code 43.
  • Right-click it and select Update Driver.
  • Choose the option to search automatically for updated driver software.
  • Restart Windows 10 after completing the installation.

4. Uninstall and Reinstall the Device

If updating the driver does not work, remove the device from Device Manager and let Windows detect it again.

  • Open Device Manager.
  • Right-click the affected device.
  • Select Uninstall device.
  • Confirm the removal.
  • Restart the computer.
  • Allow Windows to reinstall or detect the device driver.

5. Check for Hardware Problems

If error code 43 remains after reinstalling drivers and updating Windows 10, the problem may be hardware-related. Test an external device on another computer if possible. For a graphics card, USB controller, or other internal component, check whether the hardware is properly seated and receiving adequate power.

What to Do If Error Code 43 Still Appears

When none of the standard solutions work, inspect the device's Properties window in Device Manager for additional information. You can also check whether the problem began after installing new hardware, updating a driver, or changing system settings. Reversing a recent change can sometimes identify the cause.

If the same device produces error code 43 on multiple computers, there is a stronger possibility that the hardware itself is defective. In that situation, contacting the device manufacturer or replacing the faulty component may be necessary.

Final Thoughts

Error code 43 does not always mean that hardware has permanently failed. Temporary connection problems, driver conflicts, outdated software, and Windows compatibility issues can all trigger the error. Starting with a restart and connection check is therefore worthwhile before moving on to driver and system troubleshooting.

For both Windows 11 and Windows 10, updating or reinstalling the affected driver is one of the most useful solutions. If the error continues despite clean driver installation and system updates, testing the hardware on another computer can help determine whether the underlying problem is software or physical hardware.