You need the SATA drivers on a floppy. Look in the downloads section for the drivers. Windows setup asks if you need to add a SCSI driver. When it asks, press F6 with the driver floppy in.
I cannibalized because it was my understanding that you need the AHCI enabled for RAID configuration. If you are NOT going to use a RAID array, then to my knowledge, you didn't lose anything... that is the ultimate question I was trying to determine before. The Dell support group told me for "floppyless"... ah heck, here's the link
Anyway, hope this helps!
i went and bought a usb floppy. after a LOT of messing around, i got all the files needed and put them on the floppy, worked great.