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what version of cr is installed?
for canon eos 7d you need cr 5.6 or better.
ps cs2 can only be updated to cr 3.7
you can use adobe's free dng converter (https://blogs.adobe.com/lightroomjournal/2013/06/camera-raw-8-1-and-dng-converter-8-1-now- available.html) or purchase a more recent ps version (http://www.adobe.com/products/photoshop/buying-guide.html)