Complete the following in the order listed below until the issue is resolved:
  1. Use add/remove programs to uninstall the Microsoft Office 2007 Primary Interop Assemblies, if present.
  2. If an unsupported version of Office was previously installed, then:
    1. Uninstall Office using Control Panel so that no versions of Office are installed
    2. Use Microsoft's cleanup utility (or other similar utility) to remove files, folders, and registry keys left behind after the uninstall,
    3. Install a supported version of Office.
Contact the appropriate software vendor or IT professional for assistance with this process or issue, which is beyond Blackbaud's scope of support.