Word automation (Word.ApplicationClass, TYPE_E_LIB_NOTREGISTERED)

Hi!

I have an .NET app on many machines at customer's office. App is doing some word automation (opening a document and doing a search replacing on some keywords).

Recently one machine was completelly reinstalled with Word 2003 SP3, Windows XP (all updates).

Now I get this exception:

System.InvalidCastException: Unable to cast COM object of type 'Word.ApplicationClass' to interface type 'Word._Application'. This operation failed because QueryInterface call on the COM component for the interface with IID '{...}' failed due to the following error: Library not registered (Exception from HRESULT: 0x8002801D (TYPE_E_LIB_NOTREGISTERED))

at this line in code:

Word.ApplicationClass WordApp = new Word.ApplicationClass();


I tried to change that to:
Word._Application WordApp = new Word.ApplicationClass();

but of course that didn't work..

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