i'm not sure if i missed something but...
y r u using redhat 8, use the latest redhat 9 (if you're up to downloading 3 more cd's
anyway, are u doing a clean install (completely wiping your hdd) or are u trying to dual boot?
if you are dual booting, i suggest finding a way to back up your data and then do a clean install
also, i hope u like mandrake, it is often looked down upon as a newbie distro, but i think even experienced users will find it very useful in allowing advanced work being done on it