Don’t install that ndiswrapper but the firmware for that adapter.
Make sure that the bcm43xx-fwcutter is installed. If not do so.
If you are able to connect with a cable open a console and make yourself root. Than type:
install_bcm43xx_firmware
If you cannot connect with a cable tell me and I will explain you how to do this manually. Whatever, you need a working internet connection at least on another machine.