dhtmledit DocumentHTML return com exception

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C#

Hi everyone,
Please I need help.

I'm using dhtmledit control, when I'm settings the DocumentHTML property I get an exception:
'DHTMLBox.DocumentHTML' threw an exception of type 'System.Runtime.InteropServices.COMException'
Source:"Interop.DHTMLEDLib"

and the control is always busy.

I'm working on windows 7 64 bit (The target complie is X86)
in xp everything works fine.

Thank you very much