"The Memory Card in Slot A is Damaged and Cannot Be Used"

[HoistedbyPetard]

So I was playing LoZ: WW when, for some reason or other, my PC froze and had to be turned off manually. After rebooting the computer and restarting Dolphin, when I tried to load my file, this message came up (the same is true for my LoZ: TP file). I've already tried Tools>MemCardManager>FixChecksums, but that hasn't worked. I tried deleting Memory Card A and creating a new one with this programme, but when I try to save the GCIs as new memory cards, I get the message "An error has occurred: Could not find part of the path...[insert location here]". Not sure what I'm doing wrong here. I would try switching to Slot B, but as far as I know, the Zelda games don't check for slot B memory discs.