How to take photos/videos from my iphone and put them on my computer?

I have an iphone 4s and i want to know how to upload/save pictures and videos onto my itunes? When i plug my phone into my computer to back it up, it backs up everything but not my pics and vids. A box comes up saying 'import pictures' so when i click yes, it only imports 125 of the 700+ that i have on my phone. Not sure how i do it, but need to make some room on my phone, yet don't want to lose all my stuff!

Can anyone help?

When it is connected click view folders or whatever. Find your videos/photos then copy the to your desktop or any folder.