Now I may know the reason for my boot error.. but am unable to think of a way to fix it. Well the only way I thought of, I didn't want to try (total system reboot - losing all my files) but I finally resigned myself to it, but that didn't work either. Basically I downloaded a patch for a system32 driver - tcpip.sys to be exact, managed to replace the file but after reboot windows wouldn't load (vista). Safety mode wouldn't even work (since tcpip.sys is a vital driver). When I tried to format using my Windows Vista OS CD I got to the 'press any key to boot from CD screen' which I dutifully pressed any key, then a loading bar appeared - loading windows files. When it completed it loaded the background for Windows Vista before you log in - but there was nothing on screen, no log-in options, no other options at all. The screen was empty but not blank. I have no idea what to do. I can't even format if it won't give me the option to (although if someone knows of a way of replacing the tcpip.sys file with the original without losing my files I would greatly appreciate it). Any system specs you need to know, let me know. Windows Vista AMD Phenom 9550 Quadcore Processor 2200MHz 4GB Ram, AMD 770 Chipset Motherboard Any ideas would be gratefully received, thank you.