After installing an agent you notice that parts of the Agent didn't install correctly or are missing. This can include, but is not limited to, the Remote Control services, Registry settings, and Softmon registry setting, Looking in the Application Event Viewer you see Error 1720.
There is a problem with this Windows Installer package. A script required for this install to complete could not be run. Contact your support personnel or package vendor. Custom action  script error , :  Line , Column , 
The scripting files on the computer have become corrupt.
Installing Windows Script 5.6 will repair any of those corrupt files.
Note: Thanks go out to the RXAmerica team for finding this solution.