Redhat setup can't find my cd-rom or my HD, so I can't even get past the first screen. I imagine it has something to do with ultra 66, and I would know how to fix it if I had redhad installed already, but I don't have much power when installing.
This may help. I saw this on FreshMeat, although I can't vouch for it as I haven't tried it. It's a RedHat ATA/66/100 Install Disk which claims to work for RedHat 7.0: