Flash Player 17 will install on your machine. Installs are not blocked based on processor speed, however, depending on what you're doing performance may be impacted (e.g. heavy gaming, etc).
Well, in that case I have no clue what´s wrong :-( It seems more people have same problem, i.e. just after installation process starts it stops on 25-30% or so and hereafter nothing happens or can be helped. Strange. Try Adobe helpdesk tomorrow... But thanks Maria for your processor fault elimination :-)