I don't know about RH 7.1, but I assuming it will be similar to 7.2.
First, make sure the right CD is installed. 7.2 has 2 CDs and only one will boot.
Make sure your second hard drive has space left on it. Linux does not use FAT32 and if you are not using that drive for Windows you will have to reformat it for Linux.
Sorry I don't have more info, pretty much a newbie myself. However, I do belive they recommend RH 7.2 over 7.1. You might try to get 7.2 and install it instead. It installed really easy for me. Everything worked.