RegCat run-time error -2147319779 (8002901d) Automation error Library not registered

Error Message

While installing or uninstalling ArcGIS Desktop, the following error is received:

"RegCat
Run-time error '-2147319779 (8002901d)': Automation error
Library not registered."

Or when launching ArcMap, the following error is received:

"Startup
Automation Error
The specified module could not be found."

Cause

This error occurs when the Window Script engine is missing from the computer.

Solution or Workaround