How to transfer photos and videos from my iPhone 4S to my Windows Vista PC?

With my old 3GS, I used to just plug it in with a USB cable and a dialogue box would open on my PC to see if I wanted to 'Import Pictures with Windows'. This used to import all photos and videos on my iPhone. Then I got a 4S and this still happened, but it would only import the photos, not the videos. Now I'm not even getting the dialogue box. How do I transfer my files please?

Go into "My Computer" and find your iphone (Itunes has to be open). Then, browse into your phone through your computer and you'll find folders named after dates in the calendar, your videos will be in one of the folders.
When you have found your videos, just drag them to ex. Your desktop.

You need to install itunes and than you can transfer all what you want