You will need to rerun Office setup to install .NET programmability support.
Do the following:
- Open Add/Remove programs in control panel (Programs)Select Microsoft Office 2003 Professional and click "Modify" or “Repair” (not uninstall)
- Select Add/Remove Features for Word and click "Next".
- Select to install “.NET Programmability Support for Word” as displayed in the screenshot below.
Click "Update" to install this feature. Then redo the installation of Aligned Elements.