yes it is. the Canon Rebel T3.
According to the Read Me file for ACR 6.4
"The Camera Raw 6.4 plug-in is not compatible with versions of Photoshop earlier than Photoshop CS5 or versions of Photoshop Elements earlier than Photoshop Elements 8 for Windows and Photoshop Elements 8 for Mac. "
So I'm not sure how you applied it or whether it is compatible.
You may need to upgrade PSE or download the free DNG converter.