I've found some troubles too, trying to install RedHat 7.1 in 4 times, four different machines.
The only way I've found to finish a good installation was in "TEXT" mode.
In the end of the install process you'll be able to use the graphic interface.
To make the installation in text mode do this:
In the start screen type text and press enter. In this mode you will go without mouse support.
Keep in your mind that i'm a newbie in Linux too!
I hope it can help you.