Push F6 and install the gay SATA drivers from the floppy that came with your motherboard/SATA controller. Alternatively you can slipstream them into your install CD.
FWIW, SATA isn't even worth the aggravation caused by the need to keep a f*****g floppy disk around. The only advantage is the smaller cable; it doesn't make anything faster unless maybe you're using a 15k rpm drive. I recently went from SATA back to IDE because I had 3 WD SATA drives die, and IDE was just cheaper and easier.