After googling your error, these 2 links may indicate that bcm43xx may not work for your card yet.
The bcm43xx driver is seems to be very active on the development side. So, if it is not working yet for your card you shouldn't have long to wait.

http://www.uwsg.iu.edu/hypermail/lin...05.1/1318.html

http://www.uwsg.iu.edu/hypermail/lin...05.1/1333.html

I think you should try to repair ndiswrapper, after knoppix boots up. I have encryption when using that method, and dhcp which is probably more important in wireless circumstances.

If you try to fix ndiswrapper, then I must also recomend getting the kernel module source package,
which will not compile if you don't disable usb support. (You'll get an error on line 665 in usb.c)
For others with usb cards... here is a patch that fixes that one:
667c667,668
< pipe_handle->bEndpointAddress, interval);
---
> pipe_handle->bEndpointAddress,
> pipe_handle->bInterval);



You can use the "Manage Software in KNOPPIX" item found in the Knoppix -> Utilities to upgrade to these 3
ndiswrapper-common (1.23-1)
ndiswrapper-source (1.23-1)
ndiswrapper-utils-1.8

Or just get them straight here.
http://packages.debian.org/unstable/...wrapper-source
http://packages.debian.org/unstable/...wrapper-common

This one has a 386 and a 64 bit version...
http://packages.debian.org/unstable/...pper-utils-1.8
So I would let kpackage pick

But I found the kernel driver version 1.16 was lacking, and the source 1.23 version works, though it does emit some harmless messages in the system log when I change things around.

If you tell kpackage to get the source for the kernel module, it will be downloaded to /usr/src
(I just copy it to the desktop and extract it there.)
go to the new folder and do a
make ; make install

Although, once you decide to upgrade the kernel module, you'll need to get the newer debhelper too
http://packages.debian.org/unstable/devel/debhelper
In case you are wondering... I don't do this evertime I bootup, I have it in scripts that start when Knoppix loads my configs.tbz.
They add about a minute to start knoppix, but having wireless makes it worth it.

If you would like, you can email me directly and I will just send you the files to try out. You have been without wireless for too long.

best,
john