This question has been asked many times. A simple solution is to right click on the recycle bin and select open. Then highlight the file(s) you wish to keep and click on the restore items button located at the top of the window. By doing so, the files will be restored to their original location on your computer.
However, what if the files were deleted from the recycling bin? In this situation there are software programs available for free. One popular file recovery program is called Recuva from Piriform. The program is easy to use and is very effective restoring deleted files. Not only will Recuva restore files emptied from the recycling bin, but it will also restore deleted files by user error from digital camera memory cards or MP3 players. In addition, the program will also recoup files that have been deleted by bugs, crashes and viruses.