Why does my iPhone 6 not show up in my computer when it's plugged in with the USB cable?

Hello

I have an Iphone 6 for about one week now. I would like to view my photos and movies on my laptop (windows 7). But I can't view them because it doesn't show up as a portable device in my computer. When I plug it in I do hear the sound as if any USB would make.

Does anyone know what's going on? Am I doing something wrong?

Thanks a lot!