Disk Digger is an excellent recovery tool for windows which allows you to recover your accidentally deleted files or anything which you deleted sometimes back and want to recover. This stand alone application can read your harddrive or usb devices and if the sector on which the files was there is not overwritten by something else will get you the files back.
After the files which can be recovered is listed, all you need is right click and save it to somewhere else. It is always a good idea to save the deleted recovered files to any external harddisk so you dont miss any other. Give Disk Digger a try