I always download the newest verison of the WinTV software of off Hauppauge's site.
What model of card do you have (WinTV, WinTV USB, PVR-150/250...)?
I have a WinTV USB, a WinTV PCI, and (lastly) a PVR-250. I believe I have the original CD's that came with them.
I believe they provide the software free, so I don't mind letting you download it from me (or if you have gmail, in 10MB chunks), or I can burn you a copy and ship it to you.
I'm at work. Let me get home and check.