Version 2 - Reviewed: March 24, 2012
The error that you get about missing interop files is usually the result of Office 2003 .Net Programmability Support not being installed. The interop assemblies are not part of the "Typical" Office 2003 install. To install, either "Full" setup must be selected or "Custom" setup with selecting ".NET Programmability Support" for the desired products (for TariffShark, Word .Net Programmability support is needed).
There's also few ways to correct the problem after Office 2003 is installed:
You may need local administrator rights on your PC in order to take the steps outlined above.