If you have only reformatted the HD and not repartitioned it, you can recover the file if no other files have been added to the drive. In other words, the data should be there if nothing has been written on top of it.
There is a free utility that I have used, and it usually can successfully recover a file. I have never tried it on a reformatted disk, however. If it does not work, then Norton Utilities is the best choice.
Try PC Inspector File Recovery at www.pcinspector.de/file_recovery/UK/welcome.htm. If you google the WWW for file recovery, you will find other options, as well.
Good luck.