I got a new dual core Dell system with RHEL4 pre-installed and received all the CDs also for box 32b x86 and Intel EM64T

Some of the applications i would liek to run require 32 bit libraries. The lib64 is there but there's no /usr/lib

What's the best way to get "install everything", specially the 32 bit.

Which install CD should i use the 32b or 64b one?

Can I put in one of the install CD and the system will get fixed without losing the apps i installed or do i need to do a complete new install