Vista OS hangs at crcdisk.sys?

hello i got a gateway laptop it came with xp tablet i got a vista disk from a friend n loaded vista on it now it wont go past the crcdisk.sys when i try to boot in safemood. if i do normal startup the little green bar just keeps on rolling n rolling nothing happns i tried all the other safeboot options as well but nothing seems to work. now i dont hav the vista disk anymore is there any way to fix this problem . also when i put the xp disk in to restore it it says my harddrive can not be found (saic) harddrive i think i got. anyway to get past this. at this point computer does not load into windows...