How to initialize FAXCOMEXLib FaxServer ?

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C#

I try to use FAXCOMEXLib library, but I have a problem with first line! :/
I read many examples, and I do this like that:

FaxServer objFaxServer = new FaxServer();

The program throw an exception:
Unable to cast COM object of type 'System.__ComObject' to interface type 'FAXCOMEXLib.FaxServer'.

So I try to do:

IFaxServer objFaxServer = new FaxServer();

The same result.

When I do it like that:

FaxServer objFaxServer = new FaxServerClass();

or

FAXCOMEXLib.FaxServer objFaxServer = new FAXCOMEXLib.FaxServerClass();

a compile error occurs:

Interop type 'FAXCOMEXLib.FaxServerClass' cannot be embedded. Use the applicable interface instead.

what's going on? please help