Your camera came with software. Have you installed it? It will have a program that can handle raw. More than likely, unless you have a pretty old camera you are going to have to use the software that came with the camera, convert it to another format and open it in Photoshop or buy a new version.
Adobe is very bad about not supporting a particular version once they have a new one out and they do not make their Raw image plugins to work with any version except the current one.