When Malwarebytes is blocked by Windows Defender, it means Microsoft’s built-in security system is preventing Malwarebytes from running, installing, updating, or accessing certain features. This usually happens because Windows Defender is designed to protect the system and may mistakenly treat another security tool as a potential conflict.
While both programs can coexist in many cases, conflicts may still occur and interrupt normal functionality. Fortunately, this issue can be fixed with a few simple adjustments.
Why Windows Defender Blocks Malwarebytes
There are several common reasons why Malwarebytes may be blocked:
- Real-time protection conflict with Windows Defender
- Controlled folder access restricting app behavior
- Firewall rules blocking Malwarebytes services
- Outdated Malwarebytes version
- Corrupted installation files
- Windows security policy restrictions
- Misidentified false positive behavior
Understanding the cause helps apply the correct fix.
Basic Fixes to Try First
Start with simple troubleshooting steps:
1. Restart Your Computer
A restart can refresh Windows security settings and remove temporary blocks.
2. Run Malwarebytes as Administrator
Right-click Malwarebytes and select “Run as administrator”.
3. Check for Updates
Ensure both Windows and Malwarebytes are fully updated.
4. Try Opening Again
Sometimes the block is temporary and resolves after retrying.
These quick steps often resolve minor conflicts.
Fix 1: Allow Malwarebytes in Windows Security
You may need to manually allow the program:
- Open Windows Security
- Go to “Virus & threat protection”
- Click “Manage settings”
- Select “Allow an app through Controlled folder access”
- Add Malwarebytes to the allowed list
This ensures Windows Defender does not block it again.
Fix 2: Disable Controlled Folder Access Temporarily
Controlled Folder Access may block Malwarebytes actions:
- Open Windows Security
- Go to “Ransomware protection”
- Temporarily turn off Controlled Folder Access
- Check if Malwarebytes works correctly
You can turn it back on after testing.
Fix 3: Add Malwarebytes to Firewall Exceptions
Firewall settings may block connections:
- Open Windows Defender Firewall settings
- Allow an app through firewall
- Add Malwarebytes to allowed apps
- Save changes and restart your PC
This allows normal communication with servers.
Fix 4: Disable Windows Defender Temporarily
If conflicts persist:
- Open Windows Security
- Turn off real-time protection temporarily
- Test Malwarebytes functionality
- Re-enable protection afterward
This helps confirm if Defender is causing the issue.
Fix 5: Update Malwarebytes and Windows
Outdated software often causes conflicts:
- Install latest updates for Malwarebytes
- Run Windows Update fully
- Restart your system
Updates improve compatibility and fix known issues.
Fix 6: Reinstall Malwarebytes (Last Option)
If the issue continues:
- Uninstall Malwarebytes
- Restart your computer
- Install a fresh copy
- Activate your license again
A clean installation removes corrupted files and incorrect settings.
How to Prevent Future Blocking Issues
To avoid conflicts in the future:
- Keep both Windows and Malwarebytes updated
- Avoid running multiple real-time security conflicts
- Add trusted apps to Windows Security exceptions
- Restart your system regularly
- Monitor security settings after major updates
These habits help maintain smooth operation.
Conclusion
If Malwarebytes is blocked by Windows Defender, the issue is usually caused by security conflicts, firewall rules, or controlled folder access settings. Most cases can be resolved by allowing the app, adjusting Windows security settings, or updating both programs.
In rare cases, a reinstall may be required. Once fixed, Malwarebytes and Windows Defender can work together to provide strong protection against malware, ransomware, and other cyber threats.
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