I don't have much Linux experience, but I was able to get ndiswrapper running for my old D-Link USB wireless adapter.
After you do the modprobe ndiswrapper, use iwconfig wlan0 to see what it it telling you about the wireless adapter. (This is part of Wireless Tools package) You may need to:
Set essid to your access point's name (iwconfig wlan0 essid "Your Name"
Set encryption as required and enter WEP key.
In iwconfig, if you see all 0's for the access point MAC address, you're not connected.
Once you get connected, you may need to do a DHClient Wlan0 or similar to get an IP address.
To me, there seemed to be three hurdles: (1) Getting ndiswrapper loaded with proper Windows drivers for your card; (2), getting the wireless card settings fixed to allow you to connect to your desired access point, and (3), getting an IP address from your access point.