I tried the steps about and they did not work since my computer had the "Update Driver" greyed out. I was able to get around this by going to the "Device Manager." From there I had to check three different places to find my phone.
1. Imaging Devices
2. Other Devices
3. USB Controllers
I found my iphone under option 2 Other Devices. I then right clicked the phone and selected Update Device Driver.
Select "Browse my computer for driver software"
Select "Let me pick from a list of device drivers on my computer"
Click on "Have Disk"
Paste the following C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers in the "Copy manufacturer's files from"
This worked for me.