Ok, so I've managed to get the game to install, and run smoothly enough except for the cursor. I know your supposed to move the curser over the enemies to attack them (allegedly) but it doesn't seem to work with me. Does anyone know what the problem might be?

Hold down the right mouse button while you move the cursor.

Make sure you have your weapon drawn. The A key ready's your weapon, you'll be able to see your weapon when it's drawn. Press F1 to get to the menu and click the 'NEXT PAGE' button to get to your inventory screen.