Software⏱️ 3 min read📅 2026-05-29

How to Fix: Why does a Windows antivirus full scan crashes my PC?

Windows antivirus full scan crashes PC, possible causes and solutions.

Quick Answer: The issue might be caused by outdated or corrupted Windows Defender definitions, or a conflict with other security software. Try updating Windows Defender definitions and disabling any unnecessary security software during the full scan.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

A Windows antivirus full scan can crash your PC due to various reasons. The most common cause is the outdated or corrupted system files, which can lead to a blue screen of death (BSOD) during the scanning process. Another possible reason is the presence of malware or viruses that are not detected by the antivirus software.

⚠️ Common Causes

  • Outdated or corrupted system files
  • Malware or viruses not detected by the antivirus software
  • Incompatible antivirus software with Windows Defender

🛠️ Step-by-Step Verified Fixes

Method 1: System File Checker (SFC) Scan

  1. Step 1: Open Command Prompt as Administrator and type `sfc /scannow` to scan for corrupted system files.
  2. Step 2: Restart your PC and run the full antivirus scan again to ensure that all issues are resolved.

Method 2: Windows Defender Update

  1. Step 1: Open Settings and navigate to Update & Security > Windows Defender.
  2. Step 2: Click on the toggle switch to enable Windows Defender and ensure that it's set to run full scans regularly.

Method 3: Malwarebytes Scan

  1. Step 1: Download and install Malwarebytes from the official website.
  2. Step 2: Run a full scan with Malwarebytes to detect and remove any malware or viruses that may be causing the issue.

💡 Conclusion

By following these steps, you should be able to resolve the issue and prevent your Windows antivirus full scan from crashing your PC in the future. Remember to always keep your system files up-to-date, use a reliable antivirus software, and run regular scans to ensure optimal performance.

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