What do you mean "will not let me edit raw files"? What do you see on your screen? If there is an error message, please quote the complete error message exactly, word-for-word, verbatin.
Before importing it says "preview not available" after importing a dialogue box pops up and says "the files are from a camera which is not recognized by the raw format support in Lightroom. (149)"
I have a canon rebel t4i
Sent from my iPhone
Support for that camera model was introduced with ACR 7.1 and LR 4.1. Time to upgrade to LR 5, see the screen capture.
There is a work around option, use the latest DNG converter from Adobe and convert the raw files to DNG format and LR 3 will be able to work with the dng files. Be aware you will not be able to utilize the new technology available in LR version 4 & 5.