So how can I watch sky on my pc with a pci card (remembering that I am a sky subscriber)?

I am currently in the process of obtaining a pc card to use with progdvb but have a couple of questions before I go ahead.
Firstly, I subscribe to the sky sports package but am not currently subscribing to hd. Would I be able to subscribe to sky hd without a sky hd reciever as I have heard they ...