Configuration :: Converting Word Document To HTML Page ?

I've a aspx page that convert a word document to a aspx page.

At my devemopment PC anything works fine but at Windows Server 2008 I'd a lot of trouble, starting with the error:

Retrieving the COM class factory for component with CLSID
{000209FF-0000-0000-C000-000000000046} failed due to the following error:
80070005

(Like this thread http://forums.asp.net/p/1423138/3163090.aspx#3163090?Interop+problem!)

But this solution doesn't work for me, the error was the same.So I found an other thread somewhere in the net that suggest to use <identity impersonate="true" userName="user" password="userpw"/> to solve this problem.

This works paticaly, I get no more access error and can create a new instance of the word application.But now I get an error in this line:

objApp.Documents.Open(ref wName,ref missing, ref readOnly, ref missing, ref missing, ref missing,ref missing, ref missing, ref missing, ref missing, ref missing,ref missing, ref missing, ref missing, ref missing, ref missing);

Microsoft.Office.Interop.Word.Document oDoc = objApp.ActiveDocument;

Exception: Command not available as no document is loaded

[Code].... why I can now create an instance but not open the document ...