I think it's a little bit tricky but you can solve your proble.:
Download the latest Intel Chipset Driver v22.214.171.1249 http://downloadcenter.intel.com/confirm.aspx?httpDown=http://downloadmirror.intel.com/20775/eng/infinst_autol.zip&lang=deu&Dwnldid=20775&OSFullname=Windows+XP*&ProductID=2300
Unzip the file and read the readme.txt in the maindirectory. There is 8b. "Installing the Windows* XP INF Files Prior
to OS Installation" So you can prepair the drivers to your installation.
Or you can create a personalized setup-CD with nlite. There you can integrate the driver.
Another way should be to copy the files from the "All"-Subdirectory to your floppy and go on with your setup routine. I think you need the 945*:* fikes. They are for the 82XXX Memory Controller Hub.