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Home/Fix/Fix Error 0x80131501 — .NET Framework Runtime Error

How to Fix Fix Error 0x80131501 — .NET Framework Runtime Error on Windows

Getting error 0x80131501 in .NET applications or Windows features? COR_E_SYSTEM or .NET runtime failure? Fix this .NET Framework CLR error.

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Main Troubleshooting Guide

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Complete symptoms, causes, and step-by-step solutions

Symptoms

You might be experiencing this problem if you notice:

  • •Application crashes with error 0x80131501 on launch
  • •.NET-based Windows features fail with CLR error
  • •Event Viewer shows .NET Runtime error with this code
  • •Programs that require .NET Framework won't start
  • •Windows component that uses .NET reports unhandled exception
  • •Error appears after .NET update or Windows Update

Common Causes

  • ⚠.NET Framework installation corrupted
  • ⚠Conflicting .NET Framework versions installed
  • ⚠Missing .NET runtime dependencies
  • ⚠Application targeting incompatible .NET version
  • ⚠Windows Update damaged .NET components
  • ⚠Corrupted GAC (Global Assembly Cache)

Solutions

Solution 1: Repair .NET Framework

  1. 1Download ".NET Framework Repair Tool" from Microsoft
  2. 2Run the repair tool → it detects and fixes common issues
  3. 3Restart PC after repair
  4. 4If repair tool doesn't help:
  5. 5Control Panel → Programs → "Turn Windows features on or off"
  6. 6UNCHECK ".NET Framework 3.5" and ".NET Framework 4.8" → OK → restart
  7. 7Then re-CHECK both → OK → restart
  8. 8This reinstalls .NET Framework components

Solution 2: Clean Install .NET Runtime

  1. 1Check which .NET version the app needs:
  2. 2Right-click app → Properties → may show in Details or error message
  3. 3Download specific .NET version from dotnet.microsoft.com
  4. 4For .NET Framework apps: install .NET Framework 4.8.1 (latest)
  5. 5For .NET Core/.NET 5+ apps: install .NET Desktop Runtime
  6. 6Run installer → restart PC
  7. 7Also run: CMD as Admin: sfc /scannow (repairs system .NET files)

Solution 3: Fix System .NET Components

  1. 1CMD as Admin:
  2. 2DISM /Online /Cleanup-Image /RestoreHealth
  3. 3sfc /scannow
  4. 4If .NET 3.5 won't install: specify Windows source:
  5. 5DISM /Online /Enable-Feature /FeatureName:NetFx3 /Source:D:\sources\sxs /LimitAccess
  6. 6(D: = Windows installation media drive)
  7. 7Clear .NET temp files:
  8. 8Delete contents of C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files
  9. 9Restart PC
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