Hi - i need serious help

I recently reinstalled windows XP, backing up my outlook files by copying
the data file to CD. I have a feeling that outlook was open when I did this
which is a problem judging by other posts, but I am not sure on that. These
files are my only souce of contacts/calander etc.

On trying to recover the data into a reinstalled outlook 2003 (by copying to
hard drive, making sure it is not read only, and by trying to open file or
import) I get the error that it 'is not a personal folder file'.
I have tried SCANPST.EXE and it says it does not work; 'does not recognise
the file and no info can be recovered'.
I have also tried outlook recovery repair toolbox and advanced outlook
repair.

Is there any hope of recovering the information, does anyone have any
suggestions?

Thanks Joanne