Install Problem

I'm trying to install RedHat9 on a compaq 1200XL that previously ran mandrake.. I blew out all the partitions and was starting fresh, but the install isn't going well. It all goes fine til it prompts for the 2nd cd, and I get an error that "this is not the correct Red Hat cd". I've tried downloading and burning the image several times from a number of sources, but it always spits out the same error message. Anyone else had this problem? (I end up just halting the install and walking away from the comp, and having to restart from scratch each time)