How to transfer camera roll from iPhone 4 to PC?

"Yesterday, my child joined a swimming match in his school and I recorded all the match process with my iPhone 4. I think, that time would be a great time and impressive memory for my child. But in case my iPhone won't work or be damaged, I wanna export this camera roll to back up on my computer. And I don't know how? Can you give me a help?

For you question, we strongly recommend our product iMacsoft iPhone to PC Transfer software, it will allow you to easily and fast export all the camera roll (including video and photo) to computer for backup. And the following tutorials we offer will tell you how to step by step export camera roll files to computer completely.
1.Download, install and run the software
Run iMacsoft iPhone to PC Transfer software and connect iPhone to computer with USB cable line.Then you can see your iPhone on the desktop -- an iPhone icon with your iPhone's name under it. All information about your iPhone, such as Type, Capacity, Version, Serial Number and Format, will be shown on the main interface.

2. Transfer iPhone camera roll to PC
1) Click "Camera" icon in the iPhone library list. All the camera roll files you record are shown in the files browser.
2) Locate the camera roll files you want to export and check them in the file list.
3) Then choose "Export->Export to local" option on the top-menu, or directly click the "Export checked files to local" button to export camera roll files and now an "Open" window pops up you can select the output folder for saving files and press "Save" button to start transferring camera roll from iPhone 4 to PC.