if it has a ribbon cable you need to move the jumper to slave and put it on the right connector.
if sata you need to install that drive and go into the bios and make sure it sees it and make the main drive first boot. you should be able to boot retrieve your pics......... or you could "hot swap after boot up. windows should find the drive and then you should be able to get pics. always write your stuff to a disc as you go. that way you will have less worries after something happens.