Memory card symbol has a small red bit on the screen and the camera wont take pictures

It is likely FULL. Try copying everything from the card to your computer. Verify the pictures are on your computer (so they you can delete them from the memory card) and then REFORMAT the memory card while in your camera. You do not want to delete them since it will wear out the memory card prematurely. Memory cards are pretty inexpensive. Buy a second, label them 1 & 2 and alternate. You'll always have plenty of room when a card fills up and you haven't copied them off yet.