Error: One of the files in the setup has an invalid certificate. File: C:\WINDOWS\Installer\The Raisers Edge.msi Invalid or no signature. when opening Outlook 2003

When opening Outlook, the Windows installer for The Raiser's Edge will start and ultimately result in the following error:  'One of the files in the setup has an invalid certificate. File: C:\WINDOWS\Installer\The Raisers Edge.msi Invalid or no signature'.
Uninstall ScanSoft PDF Professional or Nuance PDF Professional 5.  ScanSoft and Nuance merged in 2005.
Please contact the appropriate software vendor or IT professional for assistance with this process or issue, which is beyond Blackbaud's scope of support.
If ScanSoft PDF Professional or Nuance PDF Professional 5 are not installed, then this may be related to a Raiser's Edge installation issue. Review also Error: One of the files in the setup has an invalid certificate. File: [path to file] Invalid or no signature.

Environment

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