I had the same problem after changing my PC - Managed to reload CS5 with help of Adobe but it required updates which I had previously enjoyed on the old PC. After frustrating unhelpful chat with Adobe (CS5 no longer supported) I discovered a simple solution when attempting to load some other software. Try this: Go to Task Manager - select Bridge and 'End Task'. Then in CS5 go to 'Help' select updates and follow instructions. Hey Presto! Raw was updated to 6.7 and my Nikon D800e NEF files e opened without need to use the dng convertor. Result!