eXodus0426,
According to your question, I would like to recommend you two articles on the issue and hope that can help you:
1. How To: Dismiss a Dialog Box Displayed by an Office Application with Visual Basic .NET
http://support.microsoft.com/kb/307292/
When you are automating an Office application from Visual Basic .NET, the Office application may display a dialog box. The dialog box causes the Visual Basic .NET application to appear to stop responding (hang) because the Visual Basic .NET application is waiting for the dialog box to be dismissed. The dialog box must be dismissed before the Visual Basic .NET application can continue.
This article discusses how to use the object models for Office applications to avoid dialog boxes during Automation. It also provides a step-by-step example of how to simulate user input to programmatically dismiss a dialog box that cannot be avoided by using the usual properties and methods that are exposed in the object models.
2. Take Control of Microsoft Word Through Events
http://msdn2.microsoft.com/en-us/library/aa140279(office.10).aspx
3. Creating and Opening Microsoft Word Documents from .NET Using C#
http://www.c-sharpcorner.com/UploadFile/mgold/WordFromDotNet11082005235506PM/WordFromDotNet.aspx