Windows⏱️ 2 min read📅 2026-05-30

How to Fix 0x80073b01 Error – 0x80073b01 Windows Defender Cannot Be Started

Fix Windows Defender Cannot Be Started error code 0x80073b01 with expert guidance

Quick Answer: Run the Windows Defender troubleshooter and update your antivirus software.

Windows Defender cannot be started due to various reasons, including corrupted files, outdated antivirus software, or incorrect settings. To fix this issue, follow these steps:

⚠️ Common Causes

  • Corrupted Windows Defender files or registry entries
  • Outdated antivirus software or incorrect settings

🛠️ Step-by-Step Fixes

Method 1: Quick Fix

  1. Step 1: Run the Windows Defender troubleshooter by going to Settings > Update & Security > Troubleshoot, then selecting 'Windows Defender' and following the prompts.
  2. Step 2: Check for updates to your antivirus software and install any available updates.

💡 Conclusion

By following these steps, you should be able to resolve the Windows Defender cannot be started error code 0x80073b01. If the issue persists, consider seeking further assistance from a qualified IT professional.

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