well, you wouldn't happen to be trying to install onto a toshiba laptop, would ya? those things don't like linux very much...
if your redhat installer can work on other computers, it is probably the computer itself, but i don't have enough info/knowledge to diagnose the problem; if possible, you may want to try another distro (mandrake is downloadable, suse is buyable, and slackware is fun
you may want to to do some background reading onl inux, and excuse the dogmatic tone, but you don't seem like you know much; this is said only so that you avoid frustration later on when you do get linux installed
i suggest, in this case, that you use a "live-cd" distro, such as slackware live or knoppix; this simply means that it is a flavor of linux that will run directly from the cdrom and won't install anything onto your harddrive
for slackware live
suse also has a live cd, so you may want to look into that
for reading, i started out by reading the redhat 9.0 faq and manual and that helped out quite a bit; you can try starting from www.linux.org
and find some good sources there