Let's avoid duplication of efort.

Did you notice the "Solved" discussions at https://www.google.com/search?q="turn+off+usb+storage+before+using+camera

As to the USB to computer connection I'm finding folk to struggle with that as it requires drivers and maybe Windows (you didn't tell) to be in top shape. So let's tackle just that one message. I see many folk solved it.
Bob