My computer does not boot at all. It doesn't boot in any type of safe node, debugging mode, etc. None of the options in the list on windows boot manager. It says loading windows files and then stops at \windows\DRIVERS\null.sys and then just stops and restarts. How can I fix this? I also tried booting from the cd drive and reinstalling but the cd stops loading and gives me the blue screen error. How do I fix this?