As I recall, in the earlier days of Windows software, developers moved away from DOS towards writing Windows apps because there were so many different graphics cards, memory expansion systems, other code conflicts etc, that writing DOS code to run on all PC's became a major headache. One of the things Windows was supposed to do was hide all that from the application, so that programs should run on 'any' PC. Seems we've come full circle... P5 is certainy not unique in being a problem application on some systems these days. Cheers Ian