You can get back your files and data which you accidentally deleted with the help of an efficient data recovery software, i will suggest you to use Kernel for fat and ntfs file recovery software, which recover my data after a accidental format of hard disk. It has a user friendly interface in which it preview the deleted or lost or corrupted data and then you have the choice to save all or some selective files to your location. For more details go to http://www.filerecoverysoftware.net
Recuva is fantastic. And yes, do this now as Bill is correct, the more you use the computer, the less chance you have of recovering the files.
To which I add something I should have posted before - don't recover to the same drive they were stored on before - it reduces the likelihood of success. Use flash drives or another hard disk or external if you possibly can.