My MacBook Pro don't let me install any program
I've been trying to instal diferent programs to my Mac, "Adove Flash Player", or some apps, but during the instalation process it apears a message that the "program/app" cannot be completed, there are some images of what happen when I try it. Also, when I'm trying to install an app, it all seems to be alright, but when I get to the "Select a HardDisk", my HD don't appear in the options, it only appears "Install for all the users in this laptop" and even so, I can't select it, so I can't press "continue", I think that's why the "adobe flash player" cannot be installed.
Please HELP ME!!!
MacBook Pro