It's been a while since I installed ndiswrapper, but you might also need the .inf file, and perhaps running "lspci" might help locate the hardware address for your wireless adaptor. Alternatively, if you're not married to mandriva as your distribution of choice, Mepis Linux automatically detects and sets up ndiswrapper for you. (Which is why I've forgotten how to troubleshoot these problems.) Otherwise, it might be easier to download and install the ndiswrapper drivers by hand, as they include documentation to step you through all this, and it's fairly easy to follow.
Sorry this isn't a perfect answer, but I hope it helps a little.