- Use add/remove programs to uninstall the Microsoft Office 2007 Primary Interop Assemblies, if present.
- If an unsupported version of Office was previously installed, then:
- Uninstall Office using Control Panel so that no versions of Office are installed
- Use Microsoft's cleanup utility (or other similar utility) to remove files, folders, and registry keys left behind after the uninstall,
- Install a supported version of Office.
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