download an application,
MyPhoneExplorer, it's the best file manager for the current Walkman brand & Cybershot phones by sony
Connect the phone to the computer, u don't need Photoshop for anything yet. It will ask for drivers, install it, then in the phone select to save the photos in Memory card insted of Phone memory, this way, just by connecting the phone to the computer will open windows explorer from where u can just copy paste
Remember, to access phone memory (20) MB, U will need myphoneexplorer or SE File manager.
In MyPhoneExplorer, simply select the Memory status link from the left hand pane to find how much memory u have left