Uninstalling the application while other pictures were locked was a wrong move, because these vault applications assign a custom ID to those files, and even if you install it again, the pictures won't be available anymore. However, you can attempt a recovery using an SDcard reader. It will work only the pictures were stored on external device. Connect the SDcard to a card reader then access it in My Computer. Make sure to turn hidden files on and browse the SDcard. The pictures should be in a hidden folder. In case they're missing, your photos are lost forever.
