Unhandled e0434f4dh exception at 7c81eb33h solution

If you get this error Unhandled e0434f4dh exception at 7c81eb33h when after installation, you were able to start the product, but when you tried to execute a command or select one of the UI items, the product crashed and AutoCAD 2010 or AutoCAD 2011 based application you should try to repair or install Microsoft .NET Framework 3.5 Service Pack 1.
Knowledge Base document: Unhandled exception when using AutoCAD 2010-based product