my laptop wont boot i have a toshiba A215S4697 2GB ram my OS is windows vista black edition 2009 sp1 32bit i wont to "downgrade" to windows vista Business sp1 64bit but it wont boot i put in the cd(windows vista Business sp1 64bit) it loads then in goes into boot mode a black and white screen pops up that shows to type 1 so setup will Begin i type 1 but it wont show so i type the rest of the # (0-9) and none of them show ( then about 15sec. later it shows error then it goes to safe-mode.. i tried the cd on 3 laptops and it worked fine please help