My iPhone 4S won't connect to my computer. How can I fix it? (Details inside)

My iPhone 4S won’t connect to my computer. I’m using a Dell laptop that’s running Windows 7, and I have the latest software updates for my iPhone and for iTunes. As far as I can tell, the driver won’t download properly. When I first tried connected my phone a few months ago, I got an error message stating that there was a problem downloading the driver, but none of the troubleshooting options helped. Since then, my computer won’t even attempt to install the driver. When I connect my phone to the computer, my computer recognizes that something is plugged in, but it won’t show up in iTunes and my phone won’t recognize that it is plugged in; it won’t even charge through the computer. And yes, I have tried all of the USB ports on my laptop.

Any help at all would be greatly appreciated! Thanks in advance!