1 = not normal
2 = It should have replaced the default user / generic user or the one with the same name I presume not sure. You could possibly have installed and just had root and a user with a name not already in use and then once inside the old users should show up or can be used and delete new user non root user you just created. Not 100% sure about this.
3 = backup backup backup onto dvd's / usb / firewire / esata hd's .
If not formated you might be able to run a undelete or similar program that scans the disk or something to recover your pics + movies.
Best palce for this is UBCD this cd saved my but a few times already , might be able to help you as well.
If this can not recover it then likely nothing can unless you pay some company to recover it , think one has adds here on the website if you need to.
Hope this helps.