Toad Data Point does not start. Error: The type initializer for ‘System.Windows.Window’ threw an exception. (4289334)

Toad Data Point does not start or launch. Toad receives the error below.

ERROR:

System.TypeInitializationException
The type initializer for ‘System.Windows.Window’ threw an exception.
Stack Trace:
  at System.Windows.Window..ctor()
  at Quest.Toad.StartupWindow..ctor()

Clear C:\Users\<username>\AppData\Local\Temp of unwanted temporary files. A reboot may be required. If this does not resolve, the try the following steps