When you say the computer crashed do you mean that the hard drive is no longer there/good? many times it is just the operating system that is bad or corrupted and once you get that back your files might be intact.
This is why all my photos are on external drives and I have an offsite backup of everything and a full backup of everything locally that I can do a full restore from. I have lost photos before that I can not replace but that will never happen again.