You trying to install the 2.4.x or the 2.6.x kernel?
The 2.6.x kernel has supports way more hardware than the 2.4.x.
If you picked the default installation it's the 2.4.x kernel which means that you will have to compile the module manually.
If you are up to a fresh reinstall:
You can launch the installation with the 2.6.x kernel by typing this after boot from install cd:
Have fun.