Chuffer

Ok followed the guide using nlite so I could add SATA drivers so I can revert my laptop to Xp from Vista. I followed the guide and all I did was to add the SATA drivers from the floppy drive. I finished making the ISO file then burned too CD. Upon inserting into my laptop I wasn't sure whether I had to press the F6 key so I decided not too. Upon the cd getting to the screen giving me 3 option I clicked on the install one but got the usual screen saying no storage device was detected. So I rebooted and pressed the F6 key this time but as you may suspect it's asking for a floppy. Where did things go wrong? I told nlite to use the PNP option at the drivers stage or should I have just left it as text? Any help much appreciated. Chuffer