When RAW images are brought into software applications, they are normally brought in using a "default" type of "processing", for lack of a better word. The default camera profile is what most software is going to open and show the images with. Now, if that default camera profile is not set appropriately, the images will look DARK!!!!!! If the tone curve is set to what is called Linear, the images will look damned near BLACK!!!! Is this what is happening?
A picture is worth a thousand words. One way to cross-check is to shoot a few pictures using RAW _ JPEG in-camera, and to transfer both the .CR2 and the .JPG files to the software, and see. If the JPEG's look good, and bright, and crisp, and the .CR2 files look dark and dull, then you know this is what is going on. There could be other issues as well, like the default exposure is set to a steep MINUS level,etc,etc.
(I have no idea why the text above will not un-bold!!! I have tried to edit the above to un-bolded text, but it will not "take"ACK!)