i made a thread awhile ago explaining my problem with stop errors..well i have more information on the error that i still have. it is a stop error "driver_irql_not_less_or_equal (0x000000D1) and it either shows no driver or shows atapi.sys i have a 120gb as my master, and a 160 as slave. i heard that you need an updated atapi.sys to run hdd's that are over 137gb. but i havent' had this problem until i moved to pci-express. i also heard that this kind of stop error could be associated with memory..i did run memtest+ overnight and it passed all of the tests, around eight times i think. i also reformatted already. the bsod usually appears when i run a game, it doesn't happen very often when im just using firefox or other applications, but it does happen. so does anyone know what could be causing this problem? also what is the difference between raid, sata, and ide. would switching from ide to sata or raid solve this problem?