Well, you have a conexant HSF chipset. This means you have two options:
1. If you use a 2.4 series kernel you can get the last beta series drivers here:
Even though they're beta, I've found them to be much more stable than the Windows drivers.
2. If you want to use a 2.6 series kernel you have to purchase the driver here:
Both were written by the same guy, Marc Boucher.