RH Linux 6.2 to 7.3

[acate email arizona edu]

I have RH Linux 6.2 running on a laptop.  I was originally able to install
6.2 from CDs onto the laptop.  I am trying to install RH Linux 7.3 from CDs
to that same laptop, but it doesn't seem to work.  Everytime I try I keep
getting a warning message that says something like "can't install rpms version
<= 3".  The laptop doesn't have anything important, so I have also tried
to boot from the CDs and completly re-install 7.3, but that doesn't work
either.  For whatever reason the laptop won't boot from the 7.3 intall CDs.
 Does anyone know how I can get RH Linux 7.3 onto my laptop?  Thanks.