Red Hat is a subscription based distribution and comes with support. Call your Red Hat support for help.
http://www.redhat.com/
If you are not paying for it then you should not be trying to install it. Centos is Red Hat with all of the proprietary stuff and logos removed and it's free to use.
http://www.centos.org/
What do you mean it stops? It gives you a shell prompt? Or does the installer freeze?