rs-232 is a comm port. what you want is USB to LPT printer port. the LPT IS THE LONG ONE WITH CLIPS to hold cable.
ROLAND work as a printer.........at least that is to only way ive ever run mine.
i do know that rolands will cut from corel in WIN 7!!!! i had the WIN 7 RC for a while. as for flexi, cant tell ya.............