Windows Defender Not Opening Fix 2026
## Direct Answer
If Windows Defender is not opening, try restarting your computer and then check if it’s running by searching for “Windows Defender” in the Start menu. If it’s still not working, try the steps below to fix the issue.
## Step-by-Step Guide
To fix Windows Defender not opening, follow these steps:
1. **Check for malware**: Run a full scan with an anti-virus software to ensure your computer is free from malware.
2. **Restart Windows Defender**: Open the Command Prompt as an administrator, type `net stop windefend` and press Enter, then type `net start windefend` and press Enter.
3. **Reset Windows Defender**: Go to Settings > Update & Security > Windows Security > Virus & threat protection > Manage settings, and toggle off “Real-time protection” and “Cloud-delivered protection”, then restart your computer and toggle them back on.
4. **Re-register Windows Defender**: Open the Command Prompt as an administrator, type `regsvr32 msmpeng.exe` and press Enter, then restart your computer.
5. **System File Checker**: Open the Command Prompt as an administrator, type `sfc /scannow` and press Enter, then restart your computer.
## FAQ
### Q: Why is Windows Defender not opening?
A: Windows Defender may not open due to malware, software conflicts, or corrupted system files.
### Q: How do I know if Windows Defender is running?
A: You can check if Windows Defender is running by searching for “Windows Defender” in the Start menu or by checking the system tray for the Windows Defender icon.
### Q: Can I use another anti-virus software with Windows Defender?
A: Yes, you can use another anti-virus software with Windows Defender, but it’s recommended to use only one anti-virus software to avoid conflicts.
### Q: How often should I update Windows Defender?
A: Windows Defender updates automatically, but you can also manually check for updates by going to Settings > Update & Security > Windows Security > Virus & threat protection > Check for updates.
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