My platform is Windows 7 32 bit.The fact is that before formatting my computer I was able to open these dng files but as I remember I have updated my initial Photoshop CS4 version 1 or more times. Now when I go to Photoshop CS4 help and try to update the version 11.0 I get the message : There are no updates available at this time.Please note that some updates for the following products cannot be determined at this time.Adobe Updater.
The error message I get is: Could not complete yout request because it is not the right kind of document.
My RAM is 4gb and my graphics card nvidia geforce gtx 280.