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Error: “Unhandled Exception in acmgd.dll ARX Command” when launching AutoCAD

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Issue:

When launching an AutoCAD product, the following error is displayed:

Unhandled Exception in acmgd.dll ARX Command
Unhandled Exception E0434F4D (e0434f4dh) at address 7c81EB33h
Unhandled Exception E0434352 (e0434f4dh) at address 7c81EB33h

Solution:

Method 1
Add Read and Read & Execute to the group Users and/or Everyone for the following files:

Windows XP/Vista/7 x86 (32 bit):
C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config

Windows XP/Vista/7 x64 (64 bit):
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config

To add Everyone to the folder permission, please download and view this video.

Method 2
1. Uninstall all .Net version in Program and Features
2. Download dotnet 4 and 4.5.2 from Microsoft website.
Dotnet 4
Dotnet 4.5.2

3. Once installation complete, start AutoCAD to check again.

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