I Had the same problem on my TOSHIBA satellite laptop with vista, while i was downgrading to windows xp ( BSOD code 0x0000007b , 0xf78de524 , 0x0000034 , 0.00000000 , 0.0000000 ) I Set the SATA mode in the bios from ahcpi or to COMPABILTY ... this made it work !!

HOpe it helps you too !