please click on the below link and download and install the latest version of the adobe camera raw
What operating system are you using?
What make and model of camera do you have?
Did you try Help>Updates from within photoshop cs5?
You can probably use the individual camera raw 6.7 updater to get camera raw 6.7 for photoshop cs5
(camera raw 6.7 is the newest version that works in photoshop cs5. Camera raw 8.6 will not work in photoshop cs5)