Data recovery problem

I ran Windows Vista upgrade from Windows XP Pro. Many files had corrupted away with no error code leaving only void folders behind. It seemed to not discriminate based on size or location. To be safe, when I removed Vista I repartitioned all drives involved in running the OS so I thought I wouldn’t lose any more, but I lost my entire data. Unfortunately I cannot provide very much technical information about this issue to assist in tracking the problem. Please help me.