Lets try and save the data 1st and then try to repair the OS.
A repair install will only repair the OS and will leave the data intact. You will need to do all the updates.
What is the make of the hard disk (western digital, seagate, etc)?
Is it a SATA drive or a ide drive?
Make and model of the drive will allow us to search and get that info if needed.
What computer are you using now? Desktop or laptop?