You probably want to make a dedicated topic for that, though - I don’t think the mods meant for this thread to be for general discussion. I’m a little surprised it isn’t locked.
Have you got the computer with hyperterminal (which will act as server for netinstall) on the same IP range (192.168.1.x) as the client (RB450) is being given 192.168.1.2 address, your screen shot shows only local drive D:\ and not the MK RB450 device which should show as nsteme with mac address, when connected then reinstall the MK OS you are trying to use.