It sounds like your computer is only showing you the boot partition, probably because it doesn't recognise the linux-native file system format on the main partition that's filling the rest of the card. The imaging tools (dd, Etcher or equivalent) should still be able to write to the whole card if you want to reinstall player software. Similarly a partition management tool like Windows 10's Disk Manager should be able to see the other partiton and delete, resize, reformat etc. so that you can use it as a normal card again.
If the cards are really damaged you can probably still use them for a client-only PiCorePlayer installation. It's very small so there's a good chance it'll fit in before the damaged part, and it rarely writes to the card.
thankyou somebodyelse, I’ll give that a try, I even asked our IT department and they couldn’t be bothered. They just said, “Just buy another!”