I just bought a new pc and discover that after I installed my photoshop cs3, the RAW images do not convert and cannot be opened. I believe I recall from my last purchase of new camera I had to download something called ACR and a DNG converter from Adobe in order to process images. My camera is a Nikon D-300 shooting raw and I am using photoshop cs3 on a windows 7 pc. Advice and directions as to how to do this. Thank you for advice.