I am trying to install redhat linux version 9.0

in my notebook which the brand is inspiron 5100.
After i setup the swap and ext3 partition and the lilo section, i encounter problem with the administrator root password, that thing setup is not allow me to type the root username and the password which also not allow me to click Next Button.
I have try it for several time

at my notebook and try it at my friend's pc, but everything works find on my friend's pc.
anyone have experience please help me on this, coz i need that linux for my school assignment.
thanx in advance, reply as soon as possible.