I'm stumped. Yesterday morning my computer was working fine. I stepped away for a few minutes, and when I came back it was on a black screen of death saying "Reboot and select proper Boot device or ...

Bazzers on the right track... I cant recall exactly which program i used, but it re-formats and loads all the boot files , mouse drivers etc.. (approx 25Mb) Im not on vista, but im sure that there is ...