I forgot to take a look at the Event Viewer. During the installs there were Information events in the System Log.
No errors were being displayed during software installation. Various events from the source "Windows File Protection" were being created:
File replacement was attempted on the protected system file c:\winnt\twunk_32.exe. This file was restored to the original version to maintain system stability. The file version of the bad file is 1.6.0.1, the version of the system file is 1.7.0.0.
File replacement was attempted on the protected system file c:\winnt\twain_32.dll. This file was restored to the original version to maintain system stability. The file version of the bad file is 1.6.0.3, the version of the system file is 1.7.0.0.
File replacement was attempted on the protected system file olepro32.dll. This file was restored to the original version to maintain system stability. The file version of the bad file is 4.0.0.5277, the version of the system file is 5.0.4522.0.
The protected system file c:\winnt\twain.dll could not be verified as valid because Windows File Protection is terminating. Use the SFC utility to verify the integrity of the file at a later time.
The protected system file c:\winnt\twunk_16.exe could not be verified as valid because Windows File Protection is terminating. Use the SFC utility to verify the integrity of the file at a later time.