I have a Window 7 Dell Optiplex 760 machine that I wanted to switch to an identical machine but with a dual monitor video card installed in it. I downloaded the drivers for the video card, but did not run the setup. I removed the hard drive from computer 1 and installed in computer 2 thinking it would at least boot up in a vga mode. It failed to boot, making half way through the startup. I then went through the process of trying to do safe mode boots and LKGC to no avail. I then tried do the Startup repair, no good. I then put back in original box and it booted fine. I then ran the setup for the new video driver, then tried in system 2 again with no luck. Now it will not boot in system 1 either. I then thought I may have installed an XP driver instead of 7. I cannot get this machine to repair itself, windows does show a BadDriver problem in the info screen. Going to a previous restore point does nothing either.