When I insert my memory card into a card reader, the message automatically pops up saying it will be formatted. Why does it dot his?
You will see this kind of message whenever you insert the card to a device which is incompatible with it.The device would ask you to format it for to make it usable for it.
have you tried on another windows to see if you will get the message again?
Your system either does not recognize the format currently used on the card or it thinks the card is not currently formatted.