WHEN I PUT IN MY CAMARA MEMORY STICK IT DIDN'T LIGHT UP THE GREEN LIGHT AS USUAL.  I LOOKED FOR THE SAFELY REMOVE ICON ON THE TASKBAR AND IT WAS NOT THERE...SO I WENT TO DEVICE MANAGER AND THERE WAS A YELLOW EXCLAMATION BY THE USB DEVICE, I TRIED TO FIND A WAY TO SOLVE IT BUT NO LUCK.  I LEFT THE MEMORY STICK IN AND RESTARTED THE COMPUTER AND NOW THERE IS NO YELLOW EXCLAMATION BY THE USB DEVICE BUT NO GREEN LIGHT BY MY MEMORY STICK...THE ICON IS NOW ON THE TASKBAR SO I SAFELY REMOVED IT BUT WHEN I PUT MY MEMORY STICK IN IT STILL DOES NOT WORK.....I WENT BACK TO DEVICE MANAGER AND NOW THE YELLOW EXCLAMATION IS BACK AND WHEN I CLICK ON IT THE MESSAGE IS USB MASS STORAGE DEVICE I PREPARED FOR SAFE REMOVAL CODE 47....WHAT CAN I DO   THANKS