How do I fix "aspnet_compiler.dll is missing" error?

Repair or reinstall the .NET Framework. Go to Windows Settings > Apps > Optional Features and ensure .NET Framework is installed. You can also download the .NET Framework Repair Tool from Microsoft.

Is it safe to download aspnet_compiler.dll?

Yes, when downloaded from official sources. We recommend installing the official Microsoft .NET Framework package instead of downloading individual DLL files. This ensures you get a digitally signed, verified file directly from Microsoft.

Where should I put aspnet_compiler.dll?

For 64-bit applications, place in C:\Windows\System32. For 32-bit applications on 64-bit Windows, place in C:\Windows\SysWOW64. However, we strongly recommend using the official installer instead of manual placement.

.NET Framework Version 4.8.4682.0

Fix aspnet_compiler.dll Missing Error

Scanned: 2025-11-30

MD5 Verified

0.4M+ downloads

⚡ Quick Fix: Install Microsoft .NET Framework

This is the recommended fix from Microsoft. It will restore aspnet_compiler.dll and all related runtime files automatically.

Download Official Package From Microsoft.com

Common Error Messages

✗ aspnet_compiler.dll is missing

✗ .NET Framework initialization error

What is aspnet_compiler.dll?

ASPNET_COMPILER.dll is part of the Microsoft .NET Framework providing managed code execution.

How to Fix "aspnet_compiler.dll is missing" Error

1 Method 1: Run System File Checker

sfc /scannow

Open Command Prompt as Administrator and run this command. It will scan and repair corrupted system files.

2 Method 2: DISM Repair

DISM /Online /Cleanup-Image /RestoreHealth

If SFC doesn't work, run this command to repair the Windows image.

Manual Download (Last Resort)

⚠️ Important Warning

Downloading individual DLL files is not recommended. We strongly advise using the official runtime package above. Only use manual download if the official method fails.

If you must manually place the file:
• 64-bit apps: C:\Windows\System32
• 32-bit apps on 64-bit Windows: C:\Windows\SysWOW64