I think you best bet is getting a copy of windows drivers so you can use NDISWRAPPER.... Knoppix already has NDISWRAPPER installed... What you need is to download windows drivers extract them onto a USB drive or on a folder you can acces from knoppix... bring up a shell

Then as root type:

ndiswrapper -i ?????.INF (?????.INF being your inf file from your driver)

Now to verify type:

ndiswrapper -l

it should say hardware and drivers present if it does type:

ndiswrapper -m

this prepares the module for the kernel and adds the alias

now type:
modprobe ndiswrapper

Now it may stall it may give you an error... if it does try a different driver... Not all drivers work

Check dmesg

if both the module and the driver loaded you can continue w/ iwconfig.

Let me know