I believe you need ACR 7.1 which PSE10 cannot be updated to.
Use the DNG Converter to make DNGs from the RAW files and those should open in your older PSE version.
You can also buy a newer version of PSE. Perhaps do a Trial (Try) of PSE12 and see if PSE13 comes out in the next week or so.
The DNG Converter can be found on this page: http://www.adobe.com/downloads/updates
PSE12 Trial: http://www.adobe.com/downloads.html