I use a Windows 10 laptop and an iPhone 6S.
First let's talk about what you do NOT need to do. You do NOT need to install iTunes AT ALL. Period. Or at least not so in the time of the writing.
Let's read on to see how you can view the photos and videos on your iPhone on your Windows PC.
Connect
Connect your iPhone to the computer using a USB cable. I am sure you've already done that.
Check your cable
This is the key to making it work. Check your cable to see if it's an authentic Apple USB cable. You need an authentic Apple cable that connects your iPhone to your computer to make it work.
If you use a third party cable you may only be able to use it for charging.
If it still doesn't work reboot
Reboot your PC and iPhone and try again.
Questions? Let me know!