Hi Sweyel,
If you get as far as SME's installer asking for the device driver, then your steps are correct. What isn't correct, is probably the driver you have for your controller.
Although SME is based on RH 7.3, it does not use the same kernel as the RH 7.3 you download from RedHat. It actually uses an updated kernel and that is why if you are using drivers for the normal RH 7.3, it will not work.
Kelvin