Boot your PC using Disk 1 of RedHat Linux 7.1 CD set. Make sure your PC is able to boot from CD and the boot sequence is set such that CD is looked first. In doubt, check your BIOS setup.
Upon successful loading, you will see a page of description in text mode and a prompt "boot:" at the bottom of the screen.
Press "Enter" key to proceed booting.
After successful booting, you will be able to see a graphical screen showing "Language Selection" on the left-hand column.