I connect my phone with the USB charger, open My Computer and it shows up in there. Then I can browse to the pics.
Quick search on google:
click on "Start", then "Devices and Printers"
your iPhone should show up here and may have an exclamation mark (!) on it.
Right Click the iPhone icon and select "Troubleshoot"
The computer will check updates on drivers etc.
Once this has completed, the exclamation mark should have disappeared and the iPhone should now be on Explorer!