My understanding is you can't copy images back to your SD card and view or use them in the camera. The files may be on the card so you should be able to copy it to another computer, but not view it in the camera.
In the future, do not delete the images when you transfer them from your card. That is a high risk activity since you have no backup and are not certain you have good files on your computer. Copy the video or images, verify that they are okay, backup if possible, and then reformat the card in the camera.