Image size for olympus 410

i'm using an olympus 410 digital camera, i'm probably the most basic user you will ever come across.
I want to take pictures 640 x 480, i'm able to set the camera to this setting but when i turn the camera off and then try and use it again later the setting has reverted back to 2272 x 1704.
Are you able to advise how i get the camera to "hold" the setting of 640 x 480 as it's a real pain to go through the set up process each and every time i use the camera.
I have followed the the instructions on page 39 of the "Basic Manual" to the letter, but it always reverts back to 2272 x 1704.
Can you help ? Please !!