hi there fernando.seems like both of us are confused about this topic.me,confused with your answers and you, confused on how i ask those question.if you'll allow me, i'll restart this topic.i'll tell you the whole story of this problem i got... currently, im running Wvista.so i could see all the hardware installed on my pc in device manager. in the storage controller i have, nvidia nforce raid controller nvidia nforce serial ATA controller and here im sure that im using nvidia nforce controller not intel sata controller, now, because i want to downgrade my pc to Windows XP im always getting trouble with XP the problem is this>>>>...............after 'setup is starting windows' >>>EULA (f8) error appears!!!! Unknown Disk (there is no disk in this drive.) Unknown Disk (there is no disk in this drive.) Unknown Disk (there is no disk in this drive.) Unknown Disk (there is no disk in this drive.) after ENTER ,,, i got BSOD!!! what should i do to install the XP properply