I'm not sure that I understand you correctly.
I get this communicate when I work in AutoCAD LT 2010 on windows XP.
I've installed .NET Framework 3.5.
I've reinstall all software and frameworks also.
But this problem is still exist.
What shall I do now?
Since one of the posts speaks to removing all instances of .NET and reinstalling those you may need to follow this advice:
And to ensure a clean install of AutoCAD:
Autodesk Recommended Clean Install Procedure:
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