Have you tried to simply use the camera card/insert into card reader?
And, have you made sure that Finder Preferences is set to show external devices on the desktop?
Also, what are your settings in both iPhoto and Image Capture for external devices/download pics?
You don't need a "driver". You should simply see the icon of the card on your desktop and can open it, or you should set up an application (iPhoto, Image Capture, or, if you want - but not necessary - Canon Software) to automatically download/import your pics.
I've been using various Canons for years; my preference is to simply show the card icon on the desktop where I can check the pictures and decide where/what to do with them.