The easiest and most thorough way to transfer your iPhone photos to your laptop is to use a professional data transfer application such as TouchCopy. Photos from a Camera Roll can be transferred without this software (Option 2), but to transfer photos from other albums, TouchCopy is needed. You can use TouchCopy to access and copy any data from your device, including Music, Contacts and Messages. It works with all iPods, iPhones and iPads and you can install it on either PC or Mac systems.
Option 2: To transfer photos from iPhone to Laptop using Windows Explorer, follow these steps...
As previously mentioned, if your iPhone has multiple albums from different sources, you may need to use the method in Option 1. However, for photos stored in your iPhone Camera Roll, you can transfer you photos directly to your laptop using Windows Explorer.
Let's get started...
With your iPhone connected to your laptop, create a new folder on your desktop. This is where you'll copy your Photos to. I've called mine 'Photo-Transfer' in this example.
Open Windows Explorer on your laptop. You'll see a list of your removable storage under 'Computer', click on your iPhone listing.
Click through Internal Storage -> DCIM to find your Camera Roll photos.
Select the photos you wish to copy to your laptop. Right-click and select Copy.
Open up your folder that you created earlier on your desktop. Right-click and select Paste.