"Error: Boot sector not found." Nooooo! Your hard drive wont boot and there is so much data on there you need! (Shame on you for not backing up, but thats another post ;) Before you throw that tower out of the window, take a look at a great piece of software. Its called PC Inspector. So how does it work? Well after you purchase a new hard drive and installed everything on it, you can attach your crashed hard drive to the ribbon cable as a slave drive. Your BIOS must recognize it as a hard drive, but Windows doesn't have to. When you run PC Inspector it sees that crashed hard drive even if it wont boot! This way you can look at the files on the crashed hard drive and actually save them to the good hard drive. This program will also recover deleted data and even data from the drive after its been formatted! This is a German shareware program that is proven itself extremely useful on many occasions and is quite easy to use.
Link: PC Inspector