I was installing the sp1 update and it was going fine until the restart point when there was an error and it froze, after restarting the computer it just flashes with the blue screen of death and reboots and so the cycle continues. I cant run safe mode or anything, I downloaded the Vista x64 boot disk as i didnt recieve and disk with my computer but when it boots of the disk after loading disk contents it blue screens me again. I know there is nothing wrong with the rest of my hardware as i have put in an old xp harddrive and everything runs fine. I know its not a problem with the boot disk because when i unplug my main hd the boot disk loads up as i presume it should but there is no sign of windows on my 2nd hdd so it cant do anything. I dont mind loosing any data on my main harddrive i just dont know how to re-format it as the boot disk won't work and i have no other vista disk. Any help please??