If your wifi card is ipw2200, then do the following:
create the following file /etc/init.d/ipw2200:
__________ Strat below this line ___________
#!/bin/sh
#
modprobe -r ipw2200
modprobe ipw2200
ifup -a
________ Stop above this line ______________
save it and execute the following command with root preveilage:
chmod +x /etc/init.d/ipw2200
then run rcconf and select ipw2200 and hit ok.

To test it, just run /etc/init.d/ipw2200 and should work. if it does not, just setup the essid from KNOPPIX menu. If it works fine, it will detect it every time you reboot your system.