The file is mup.sys and I want to try to copy over the file with an uncorrupted version. I am using Vista, and want to do the equivalent of a repair install in XP, but I can’t boot into Windows, even in safe mode. Alternatively, I tried to remove my hard drive and connect it via usb adapter to another computer to copy an uncorrupted mup.sys, but there is always a vista permissions error that will not let me copy over the file. Is there a way to copy over a corrupt file? I have the Vista DVD.