Upgrade to a newer Elements, or use a DNG Converter (7.1 or higher) to convert the CR2 files to DNGs, and those DNGs will open in the older Camera Raw plug-in in Elements 9.
The camera requires at least Camera Raw 6.7. The latest version that is supported in Elements 9 is version 6.5. So, aside from upgrading to a newer version of Photoshop Elements, your alternative is to download and use the free DNG converter from Adobe. What operating system are you using?