Version 11 is Money 2003.
You have only a single backup, and no backup on different media? Ouch. How old is the backup?
Copy the backup and more importantly the *.mny file, to other media, such as a USB flash drive. While you are thinking about it, copy other important files that you would miss if your main drive crashed, to other media.
You could try to repair the file using salv.exe in the Money install folder. Choose a level 2 backup, and choose a new name for the repaired file, such as hope1.
You could also see if sample.mny opens. You would be hoping not, because you would like to see a problem with the installation rather than the *.mny file.