A:
Make sure that the memory card is fully inserted into the slot
Try a different memory card of the same type in the same slot. If the different memory card works, the original memory card should be replaced
Some cards have a read/write security switch. Make sure that the security switch is set to Write Enabled.
Make sure that the amount of data you attempted to store has not exceeded the capacity of the card
Inspect the ends of the memory cards for dirt/material closing the hole. Clean contacts with a lint-free cloth and small amounts of isopropyl alcohol
If errors persist, replace the memory card
Some memory cards are not compatible with XP such as SDXC. Refer to your card manufacturer to see if your card is compatible with your OS.