Start insatallation process with option "expert". There you can specify HDD specific driver to load. If you cannot see your device in listing there then you search on Internet for Driver Floppy disk for your redhat release.
Finally there is another more expert way of doing this. You can press Alt+F2 or Ctrl+Alt+F2 to get shell prompt on VirtualTerminal2. "cd" to /tmp. You need to extract your desired module from /modules/modules.cgz using following command

gzip -d -c modules.cgz | cpio -iud 2.6.X-X/modulename.ko

There you can try loading couple of relevent modules with command insmod ./2.6.X-X/modulename.ko.

You can search for document on internet to know more about this complex way of doing.