I don't believe that you can stream cable from you're TV tuner.
Tried it once, failed.
But what tv tuner are you using?
Im using MSI, that should help.
Plus I suggest you go with that puncharger said, get location free player.
To do this you must update.
But do not update, use my tutorial on how to install devhook so you can emulate the highest firmware there is, making it able for you to use location free player:
Mailas' Devhook Tutorial