I'm afraid that you may end up reinstalling the operating system. But lets see what we can do. Normally a blue screen refers to hardware related problems but not necessarily. A bad installation or virus can also bring windows blue screen message. Since you can't go into windows no matter what, you may want to reinstall windows. I'm assuming you still have important data in the hard drive with no backup. Try installing windows and leave the file system intact. This way your documents will not be deleted. Once you get windows up and running, first thing make a backup and run antivirus scan. Norton Antivirus 2003 Professional is my favourite. Never had a single problem so you can trust the program too. I'm not aware of any antivirus that will fit into a floppy disk or run directly from cd and is bootable too. I think Norton System Works have this option but again not sure about that.