Thanks for the hint!
I looked for another way because it's much work to reinstall Backtrack.. :/
After


The Compat-Driver both adapters have been detected and the Atheros is working...

Hi,
first, I'm german but i hope i can express my problem good enough that you can help me.

I have 2 W-Lan-Adapter:

1. Internal Atheros Adapter of my Acer Aspire One D270
2. Alfa AWUS036H...