Distiller: Open Distiller, "File => Preferences", uncheck "View PDF when using Distiller".
PDF Printer: Open "PDF Printer", "Printer => Preferences", click "Printing Preferences..." button, uncheck "View Adobe PDF Results".
PDF Maker (MS Office): "Adobe PDF => Change Conversion Settings" uncheck "View Adobe PDF results".
Web Capture in Browser: "Preferences" uncheck "Open PDF files after conversion.
Adobe recommends not have Acrobat and Reader installed on the same unit and also recommends against mulitple versions on the same system.