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Dannt, I got my card working properly with ndiswrapper last night. Here's what I recommend you do;
open a terminal and login as root using 'su -'
unload the broadcom driver module because it interferes with ndiswrapper
modprobe -r bcm43xx
install ndiswrapper if you don't have it installed already
yum -y install ndiswrapper
now find the windows drivers for your card (the ndiswrapper website has a list of compatible cards where you can find info on this), you want the .inf file I think, mine was bcmwl5a.inf.
Navigate to the directory where you have the driver and type
ndiswrapper -i driverfile.inf
(using my example it was ndiswrapper -i bcmwl5a.inf)
and you should hopefully see a message saying that your driver is installed and the hardware is present (obviously your card should be in the slot )
Now you just type
and this will hopefully fire up the lights on your card and if you type
you should see the info on your card. On my system it picked up the settings I had stored using Network Device Control when I was trying to get the card working with the bcm43xx module.
If all is well at this point, check the output of iwconfig to see whether your card is wlan0 or eth1 or whatever and then edit the /etc/modprobe.conf file and add this line at the bottom
alias wlan0 ndiswrapper
(change the wlan0 to suit your settings). You can do this with 'ndiswrapper -m' but it didn't work properly for me (I had to change the wlan0 part manually anyway).
Now you need to make sure that bcm43xx doesn't keep giving you grief so add the following section at the end of /etc/modprobe.d/blacklist
# Prevent bcm43xx interfering with ndiswrapper
Now you should be all set when you reboot, you should also be able to use Network Device Control to activate/deactivate/change settings.
Let me know if this doesn't work for you. Cheers, Stu