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If you’ve ever tried to install or open a file on your Windows computer and received the error message:

“Operation did not complete successfully because the file contains a virus or potentially unwanted software,”

you’re not alone. This message usually comes from Windows Security (formerly known as Windows Defender), and it’s triggered when the system detects what it believes to be a harmful file — even if you know the file is safe.

In this article, we’ll guide you through practical, step-by-step solutions to resolve this issue — including how to manually allow the blocked file, temporarily disable real-time protection, and install the software you trust.

⚠️ Disclaimer: Only follow these steps if you’re 100% sure the file is safe and you trust the source. Bypassing your antivirus protection can expose your system to real threats.

✅ Why Does This Error Happen?

Windows Security is designed to protect your system from malware, viruses, and potentially unwanted applications (PUAs). Sometimes, though, it can be overly cautious, flagging certain files like:

  • Cracked software (even if harmless)
  • Unsigned installers
  • Tools from unknown developers
  • Custom scripts and mods

If you know the file is clean and you’re getting blocked, follow the steps below to fix the issue.

🔧 Fix 1: Allow the File via Windows Security’s Protection History

  1. Open the Start Menu and type:
    Virus & Threat Protection
  2. Click to open it from the results.
  3. Scroll down and click on “Allowed Threats”
    (sometimes labeled as “Protection History” depending on Windows version)
  4. Here, you’ll see a list of recent actions taken by Windows Security. Look for the file you attempted to install or open.
  5. Click on the blocked item — it will show the file path and action taken.
  6. Click “Actions” and then choose:
    👉 Allow on device
  7. Close the window once done.

🛡️ Fix 2: Temporarily Disable Real-Time Protection

After allowing the threat, if you’re still unable to install the file, you might need to temporarily turn off real-time protection to bypass the block.

  1. Return to Virus & Threat Protection.
  2. Scroll down and click on “Manage settings” under Virus & Threat Protection settings.
  3. Now toggle Real-time protection to Off.
  4. Also, toggle the following options OFF temporarily:
    • Cloud-delivered protection
    • Automatic sample submission
    • Tamper protection

🕒 This should only be temporary. Remember to turn these protections back ON after the file is installed.

💾 Fix 3: Reinstall or Run the Software Again

Now that the file is unblocked and real-time protection is off:

  1. Locate your installer or executable file.
  2. Run the installer or open the file again.
  3. The error should now be resolved, and the file should execute properly.

🔁 Final Steps: Turn Protection Back On

Once the installation is complete and you’re sure everything is working:

  1. Go back to Virus & Threat Protection → Manage settings.
  2. Turn Real-time protection and all other options back ON.
  3. This helps keep your system protected moving forward.

🧠 Tips to Avoid This Error in the Future

  • Download software from trusted sources only
  • Avoid cracked software — even if it seems harmless, it’s often flagged for good reason
  • If you’re a developer or using scripts, consider signing your code
  • Always keep a backup of critical files before bypassing antivirus protections

🛑 Should You Bypass the Warning?

Not always. If you’re unsure whether a file is safe, consider uploading it to VirusTotal.com — a free service that scans files using over 70 antivirus engines.

Only proceed with bypassing Windows Security if:

  • You know the source of the file
  • You trust the developer
  • You’ve scanned it independently

If you found this guide helpful, be sure to share it with someone who’s struggling with the same error!

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