I need to retrieve my deleted pst file from outlook 2007

I was having problems with Outlook 2007 so I save my pst files to my desk top then uninstalled Office 2007 and reinstalled it. I then attempted add my saved pst file to outlook. But I recalled before I can add that pst file I had to delete the new one that was created automatically when I did I deleted the pst file that was saved to my desktop. Help I really need to find that pst file. Windows stated are you sure you want to delete the pst file because the file is too big and will be permannetly deleted.