i have a dell latitude laptop 400 mhz 128 mg ram,there are 2 memory slots that can each hold 128 mb ram.when i put both sticks of memory(128 each)it only says theres 128 mb ram in it,i tried switching slots with one stick to see if i had a bad slot but 1 stick will work in either one.do i need to configure something?o ya windows xp pro,thanks bri