Oh I get it, It's the canon EOS Digital Rebel, they list it by that name instead of 300D.
Canon has been really bad about providing stuff for 7. However, they usually have a driver (not software) that will make the thing function in 7.
http://www.usa.canon.com /cusa/support/consumer/eos_slr_camera_systems /eos_digital_slr_cameras/eos_rebel_t3_18_55mm_is_ii_kit#DriversAndSoftware
take the blank spaces out of the above link
I have no idea why they have been so slow in providing software. A lot of people are complaining about it.