Can't get Photos off my IPhone onto my computer

I have three usb ports on my laptop and I don't understand why none of them are allowing me to get photos off of my IPhone 4 and into a folder onto my computer. Every time I plug it in it says no photos found. I click on the link to my IPhone folder and tell it to download pictures and it still says there are none. I open the folder and it is empty. My phone has thousands of photos I have taken on it and I'm so confused! This is so frustrating, if anyone knows how to fix it please help!

You can installed the iPhone software to your computer.

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