Does Shaw encrypt everything? If so, you are SOL, since there is no FCC in Canada to force Cable providers to allow third party devices.
See if your antenna can pick up any channels when plugged into the TV. If you can, then try any of the tuners you have, but only one, without the splitter.
Ditch the software that was packaged with ATI, and use Windows MEdia Center that is included with every copy of Windows 7, some Vista's and you need to buy it for $10 for Windows 8 pro.
It will give you the TV guide listing on screen, just lilke Shaw DVR/box for your particular postal code.
6 TV's in the house on FiOS and we only pay $4.99/month to connect them all!!! Power to the CableCard and WMC7!!!