First thing is to writing to the drive !
First try System Restore.
Click the windows orb (bottom left corner) and type in the search box (SYSTEM),here you will see system restore,select this and follow the prompts.You may need to agree to UAC prompts.
Restore your computer to a time when all was ok.
Try running Testdisk photo rec click here
PCInspector click here
There are others availble for free if needed.