Recovery of .pst files after reformatting

Hi everyone,
I have recenly had to reformat my hard drive and having done it a few times in the past, confidently thought I had backed everything up ok before I did it. I obviously wasn't paying proper attention because the Outlook files didn't back up and I have ended up with an empty Personal File Folder (ie I must have forgotten to click 'include subfolders'). Is there any way I can recover the original .pst file from the hard drive? I have tried Fix It Utilities but didn't understand anything as I don't understand the partition stuff. I also have tried using iRecover which is a bit more user friendly and it did find some original stuff from My Docs and traces of programmes I haven't reloaded yet but the only pst file it found is the current one, i.e. virtually empty.
Any help on this would really be appreciated as currently I have lost a lot of valuable emails and all my Contacts!
Jules :cry

 

you can try Easy Recovery Pro http://www.ontrackdatarecovery.com/file-recovery-software/

 

Thanks - I will give it a go.
Jules