iPhone 3GS not displaying in my computer

I have an iphone 3GS and windows 7 and am trying to get my pictures and videos from the camera roll off the phone and onto my computer but I can't figure out how, my phone no longer shows up in my computer as a device. I tried searching the forum but couldn't find an answer so I decided to register and ask it again. Thanks

 

ya I've tried that, I think the problem has to do with the way my computer is recognizing the iphone because it shows up in itunes just fine, it won't do autoplay when i plug it in (i have autoplay turned on) and it doesn't show up in my computer, so I can't choose to import photos