You need to update Camera Raw with the latest version that will work with CS4. Some of the newer cameras may not work, and you will have to use the dng converter for them.
Thanks. But it works on my old laptop ....
Did you ever update you camera raw on your old computer?
Thanks for your interest.
No, I haven't updated anything (not sure I'd know how to!).
But I can't understand why CS4 is working fine on my old computer but isn't on my new one. It uses Windows 8.
If in photoshop cs4 you go to Help>Updates, is camera raw 5.7 listed as an available update along with a few other updates?