If you are sure it was deleted, yes, you can recover it. Even if it was deleted by a trojan, there is still a chance of recovery. Files are not completely deleted until they are written over, and even then, if you try hard enough, you can restore the deleted object. I suggest this program to restore it: Restorer. When looking at the file names, remember that some files are renamed when deleted/moved to the recycle bin (Dc*.filetype, etc...).