I went to play the game on my PsP this morning, and both my mother's and my file were both removed, I then went into the psp's data utility and it was still there, any suggestions about what maybe the problum?

Have you updated the firmware recently?

just try removing it from your memory stick and placing it back in saved utility. that might work.
it could be corupted if you dropped the psp wilst playing of if the memory stick was put near anything magnetic/static eg tv. but these are only theories.

Gremlins?

I don't think there were Germins at Niagra Falls lol, and I can't get into my memory stick till wedesday.