Have a look at http://support.microsoft.com/default.aspx?scid=kb;en-us;292491


>Hi Eric,
>
>Office interops are installed. I have OfficeXP on my dev box, client uses Office 2000.
>
>Al
>
>>Are you using same Office versions? Have you installed Office Interops?
>>
>>
>>>Hi,
>>>
>>>Just trying to open a Word Document using VB.NET.
>>>
>>>This code works on my dev box.
>>>
>>>

>>>
>>>Dim wrdDoc As Word.Document
>>>Dim wrdApp As Word.Application
>>>Dim strLargEnvTemplate as String = "C:\EnvTemplate.doc"
>>>
>>>wrdApp = CType(CreateObject("Word.Application"), Word.Application)
>>>wrdApp.Visible = True
>>>
>>>wrdDoc = wrdApp.Documents.Open(strLargEnvTemplate)
>>>
>>>

>>>
>>>However, at the client site, an exception is created on
>>>
>>>

>>>
>>>wrdDoc = wrdApp.Documents.Open(strLargEnvTemplate)
>>>
>>>'The error message is "Object Reference not set to instance of an object"
>>>
>>>'Word is instantiated OK - but the document will not load...
>>>

>>>
>>>Any idea why the code works on my dev box but generates an exception on the production PC's?
>>>
>>>Is there a better way to open a Word Document from VB.NET?