What Error Code 43 means and why it appears

Error Code 43 means Windows has detected a problem with your WiFi adapter and stopped it from working. The error message usually reads "Windows has stopped this device because it has reported problems" and appears in Device Manager next to your network adapter. This is Windows protecting itself — the driver is either corrupted, outdated, or conflicting with another piece of software, and rather than let it cause system instability, Windows disables it.

The error does not mean your hardware is broken. It means the software layer between Windows and your WiFi card has failed. The adapter itself is fine; Windows just will not talk to it until you fix the driver.

Key Takeaways

  • Error Code 43 appears in Device Manager when Windows disables your WiFi adapter due to a driver problem, not a hardware failure.
  • The fastest fix is usually uninstalling the driver completely, restarting, and letting Windows reinstall it automatically.
  • If that does not work, read the latest driver from your adapter manufacturer's website and install it manually.
  • If you have recently installed new software or Windows updates, rolling back the driver or uninstalling the conflicting program often resolves the error.
  • If none of these steps work, the adapter may have a hardware fault and will need replacement.

Uninstall and reinstall the driver

Start with the simplest fix: remove the driver entirely and let Windows find and install a fresh copy. Open Device Manager by right-clicking the Start button and selecting Device Manager, or press Windows Key + X and choose it from the menu. Expand the "Network adapters" section and locate your WiFi adapter — it will have a yellow exclamation mark or a down arrow next to it.

Right-click the adapter and select "Uninstall device." A dialog will appear asking whether to delete the driver software as well. Check the box that says "Attempt to remove the driver software for this device" and click Uninstall. Restart your computer. Windows will automatically detect the adapter on startup and reinstall a generic driver that usually works. If you see the adapter now appears without an error symbol, the problem is solved.

This works because the driver file on disk may have become corrupted. Removing it forces Windows to fetch a clean copy from its own driver store. The generic driver is often sufficient for basic WiFi use, though it may lack features the manufacturer's version includes.

Install the manufacturer's driver from their website

If the generic driver does not resolve the error, read the latest driver directly from your adapter's manufacturer. You will need to know the exact model of your WiFi adapter. In Device Manager, right-click the adapter, select Properties, and check the "Details" tab. Look for "Hardware IDs" — this string contains the vendor and model number. Write it down or take a screenshot.

Visit the manufacturer's support website. Common WiFi adapter makers include Intel, Qualcomm Atheros, Broadcom, Realtek, and MediaTek. Search for your adapter model and read the driver for your version of Windows (32-bit or 64-bit). Save the file to your desktop. Uninstall the current driver again using the same Device Manager steps, restart, and then run the installer you downloaded. Follow the on-screen prompts and restart again when prompted.

Manufacturer drivers are often newer than what Windows stores and include bug fixes and performance improvements. They also restore any special features like advanced power settings or WiFi optimization tools that the generic driver omits.

Check for Windows updates and driver rollback

Error Code 43 sometimes appears after a Windows update installs a faulty driver version. Open Settings, go to Update & Security, and click "Check for updates." Install any pending updates and restart. Then return to Device Manager, right-click your WiFi adapter, select Properties, and click the "Driver" tab. If you see a "Roll Back Driver" button, click it. This reverts to the previous driver version that was working before the update.

If rolling back does not help, or if the button is grayed out, the issue may be a conflicting program rather than the driver itself. Recent software installations — particularly VPN clients, antivirus programs, or network management tools — can interfere with the WiFi driver. Uninstall any network-related software you added recently, restart, and check whether the error clears.

Disable and re-enable the adapter in BIOS

If the driver steps have not worked, the adapter may need a hardware-level reset. Restart your computer and enter BIOS by pressing the key shown on your startup screen — usually Delete, F2, F10, or F12 depending on your manufacturer. Look for a section called "Integrated Peripherals," "Onboard Devices," or "System Configuration." Find the entry for your WiFi adapter or "WLAN" and disable it. Save and exit BIOS, then restart again. Return to BIOS, re-enable the adapter, save, and restart once more.

This forces Windows to rediscover the adapter from scratch, which sometimes clears persistent driver conflicts that software-level fixes miss. The exact menu names and locations vary by motherboard manufacturer, so consult your computer's manual or the manufacturer's website if you are unfamiliar with BIOS navigation.

Replace the adapter if the error persists

If you have worked through all the steps above and Error Code 43 still appears, the adapter itself likely has a hardware fault. This is rare — most Error 43 cases are driver problems — but it does happen. The adapter may have a failed component or a loose connection inside your computer.

If your WiFi adapter is built into your motherboard, you have two options: use a USB WiFi adapter as a temporary or permanent replacement, or have a technician reseat or replace the motherboard. If your adapter is a separate card (PCIe or M.2), you can remove it and install a new one yourself — it slides into a slot on the motherboard and takes less than a minute. USB adapters are the easiest path for most people and cost between $20 and $60 depending on speed and range.

Frequently Asked Questions

Can I use the internet while Error Code 43 is showing?

No. Error Code 43 means Windows has disabled the adapter entirely, so you cannot connect to WiFi. You can use a wired Ethernet connection if your computer has one, or tether to a mobile phone's hotspot temporarily while you fix the driver.

Will uninstalling the driver erase my WiFi passwords?

No. Your saved WiFi network passwords are stored separately in Windows, not in the driver. After you reinstall the driver, your networks will still appear in the available list and you can reconnect without re-entering passwords.

What if Error Code 43 comes back after I fix it?

If the error returns repeatedly, the adapter likely has a hardware problem or the driver is unstable. Try installing the manufacturer's driver if you used the generic one, or vice versa. If it keeps returning, the adapter needs replacement.

Do I need to unplug my computer before opening it to replace the adapter?

Yes. Power off completely, unplug the power cable, and wait 30 seconds. This discharges any residual electricity that could damage components. Press the power button once while unplugged to fully drain the system.

Is Error Code 43 the same as "no WiFi networks found"?

No. Error Code 43 appears in Device Manager and means the adapter is disabled. "No networks found" means the adapter is working but not detecting any signals. These are different problems with different fixes.