I have 64 bit Vista running on this computer. It is the one I use to sync my iPhone to iTunes.
1) Plug in your iPhone to your pc.
2) Open iTunes.
3) Go to your iPhone under Devices on the left.
4) Go to the tab labeled Photos on the right.
5) Put a check in the box at the top where it asks "sync photos from" and make sure you choose the folder where your photo folders are located - usually Pictures.
6) Click the radio button for Selected folders, so that you don't sync every folder you have.
7) Place checkmarks next to those folders you want to view on your iPhone.
Remember, any change you make to these folders on your pc will be reflected on your iPhone - that's what sync means. You must leave the folders intact on your pc.