Can't install the Microsoft Office Webservices Toolkit for Microsoft Office 2003 because you are using Office 2007? This is a problem I came across a few years ago and the solution is simpler than one might expect. However, I had uninstalled it and kep the newer version saved under my back ups. Because of that, I decided to document this just in case I forget it again...

If you are trying to install version 2.01; it will fail. Instead, you should install Microsoft Office Web Services Toolkit 2.0

You can find this Toolkit here: http://www.microsoft.com/downloads/details.aspx?familyid=4922060f-002a-4f5b-af74-978f2cd6c798&displaylang=en