Windows Defender Not Working Fix 2026
If Windows Defender is not working on your Windows device, don’t worry, we’ve got you covered. The fix is straightforward: **check for updates, restart the service, and reset Windows Defender**.
## Step-by-Step Guide
To get Windows Defender up and running, follow these steps:
1. **Check for updates**: Ensure your Windows operating system is up-to-date, as outdated software can cause issues with Windows Defender. Go to **Settings** > **Update & Security** > **Windows Update** and click **Check for updates**.
2. **Restart the Windows Defender service**: Press the **Windows key + R** to open the Run dialog, type **services.msc**, and press **Enter**. In the Services window, find **Windows Defender Advanced Threat Protection Service** and **Windows Defender Firewall**, right-click on each, and select **Restart**.
3. **Reset Windows Defender**: Type **Windows Defender** in the Windows search bar, open the app, and go to **Virus & threat protection** > **Virus & threat protection settings**. Toggle off **Real-time protection** and **Cloud-delivered protection**, then toggle them back on.
4. **Check for conflicting antivirus software**: If you have another antivirus program installed, uninstall it and see if Windows Defender starts working.
## Frequently Asked Questions
### Q: Why is Windows Defender not turning on?
A: This could be due to conflicting software, outdated Windows, or a corrupted Windows Defender installation.
### Q: Can I use another antivirus program with Windows Defender?
A: It’s not recommended, as using multiple antivirus programs can cause conflicts and reduce their effectiveness.
### Q: How do I know if Windows Defender is working?
A: Check the Windows Defender app or the System Tray for the Windows Defender icon, which should be green if everything is working correctly.
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