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Fix Windows Update Error 0x800f0915 – .NET Framework 3.5 Install Error

Resolve .NET Framework 3.5 install error code 0x800f0915 by following this step-by-step guide to troubleshoot and fix the issue.


The .NET Framework 3.5 install error code 0x800f0915 typically occurs when there are issues with Windows Update or Windows Defender Firewall. To troubleshoot and fix this issue, follow these steps:

⚠️ Common Causes

  • Corrupted Windows Update components
  • Windows Defender Firewall interference

🛠️ Step-by-Step Fixes

Method 1: Quick Fix

  1. Step 1: Run Windows Update and check for any available updates. Install all pending updates.
  2. Step 2: Disable Windows Defender Firewall by going to Settings > Update & Security > Windows Defender Firewall, then toggle the switch to the 'Off' position.

💡 Conclusion

If you've followed these steps and still encounter the .NET Framework 3.5 install error, it may be necessary to reinstall .NET Framework 3.5 or seek further assistance from Microsoft support.

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