1. Download the driver file and copy it to a usb flash drive. (The driver isn't on dell.com, but can be optained from http://www.jameslittle.me.uk/installing-centos-5-on-a-dell-r200/ .)
2. Plug flashdrive into computer and boot off of the cd
3. Type "install dd"
4. When it asks ifyou have a driver disk say "yes"
5. Select /dev/sda1 and locate the driver on the flash drive
6. Then it will prompt you for the keyboard type. At this point remove the flash drive and continue normally