i get the message "setup did not find any hard disk drives installed in your computer" when i try to install windows xp on a dell dimension 5150c with a 160G WD SATA drive. the bios detects it fine and the diagnostics indicate that it's okay and norton ghost is able to access it. this post: http://www.techspot.com/vb/topic18329.html indicates that i should try setting my sata operation to "combination". i have no such setting in my bios. i have only ahci and ata for this setting. i've tried both with identical results. do i need scsi drivers to install windows? thanks for any help.