Well, okay, oddly enough the mb-clean downloaded the same version I thought I'd installed yesterday (mb3-setup-consumer-188.8.131.523-1.0.139-1.0.2060.exe) but this one seems to work properly! Thanks for the help!
Updated to most recent version of MWB. Fails to load. Error message text is exactly as shown in post title. Screenshot attached. Attached: mb-check-results.zip; FRST.txt; Addition.txt; and MBAM screenshot 2017-06-02.jpg May be interference from CryptoPrevent or Avast, perhaps. Addition.txt FRST.txt mb-check-results.zip