Fernando, you are obviously the genious when it comes to loading the necessary nvidia drivers for downgrading to XP. I have a Dell XPS 720 with one 500GB SATA drive. Apparently according to Dell I have the nForce 6 chipset in particular nforce680iSLI. My problem is like all the others on this post. I have called Dell numerous times and have worked with them endlessly, they finally told me that it couldn't be done because I had upgrade the BIOS to the recent level. Well tonight its running XP and all thanks to you!