SPAM: Unplugging usb wireless lan card causes SuSE 10 to halt

Hi all, I have a "SMC EZ Connect 802.11g" wireless usb lan card, it works great using ndiswrapper package but when I unplug it the system hangs. Even, When I issue the command: "modprobe -r ndiswrapper" and then unplug the card, the system hangs. The only way that system doesn't hang with it is the interval between issuing command above and unplugging is very short. It seems SuSE 10 reloads ndiswrapper if it sees that the card is in slot yet (dmesg also says this); So, How can I unplug network card without this problem? Any help will be appreciated, Habib