According to AverMedia x64 drivers AINT going to be developed for the tvtuner. This company is so full of shit and you should NEVER buy anything from this company again. My reasons are from experience:
1. When XP came they refused to make drivers for my brand new AverMedia card.
2. When x64 came I mailed 3 different departments about drivers, and 2 told me that there was no chance of x64 drivers being developed for this card. The 3rd told me their was some beta drivers for a newer card I could try, but apparently they wherent public.
I dont see how it can be so difficult for them to develop x64 drivers.
If you want an answer from them go to their support forum and make a post, they answer quite fast.