If you experience problems with your TV tuner card, go to the manufacturer's website for software updates and technical support. Here are websites for some of the most common TV tuner card manufacturers:
ADS Technologies, Inc.
Advanced Micro Devices, Inc. (featuring ATI products)
AVerMedia Technologies, Inc.
Hauppauge Computer Works
KWorld Computer Co., Ltd.
Leadtek Research Inc.
Pinnacle Systems, Inc.
To view a current list of TV tuner cards that are compatible with Windows Vista, see the TV Tuner Cards section of the Windows Vista Hardware Compatibility List.