Probably your kernel was built without bttv support. Some alternatives:
1. You can check if your distro provides an alternative kernel, or extra packages you can add to your existing kernel.
2. You can compile/install your own kernel. See the documentation in the source mentioned above for getting TV to work.
3. You can try a different distro. For example, there is a good chance that a recent Knoppix live CD will work straight away, and you can try it without touching your current setup.