Nvt3.$tmp file stopping me from formatting sd card

I tried to upgrade my cards in the cameras and decided to reuse old ones in different devices, but when I tried to format the cards for use in another device, this file (recording.nvt3.$tmp) remains stuck in the card making it write protected. I have tried everything I know including cmd prompt formatting and removing properties, even putting it back in the camera and trying to format it there, nothing. Any help, or do I now just have junk cards?