Recovery programs might be able to recover files. When you delete things it doesn't actually delete them from the hard drive, it just deletes the link from the hard drive to windows. When this link is gone it means that the file on the hard drive will be able to be overwritten. So if you are going to go ahead with one of these file recovery programs then you shouldn't do anything on your computer or install anything except the program to recover the files. If you are very serious about it and desperatly need the photos then you could turn off the computer now and make the hard drive a slave driver on another computer and install the program on the other computers hard drive but make the software run on the harddrive with the photos on but this can be complicated so its up to you.