You're jumping ahead to quadratic equations before learning addition & subtraction, so expect some frustration.
ndiswrapper is a program that allows for Windows drivers to be used in a Linux environment. To make your Broadcom wireless card work, you'll need ndiswrapper since there is no native Linux version of the driver.
An old version of ndiswrapper is included in Mandrake 10.1. It might work, although a more current version is my suggestion based on my experience and what I've read. More on that in a sec.
ndiswrapper needs to be run, pointing it to the place where a copy of your Windows drivers are located. This means copying from one partition to another, mounting a partition - probably NTFS - support for which may not be in your installation. (I'm assuming a dual-boot install) Alternatively, you can transfer the files via floppy, USB stick or CD, but you'll still need to learn a little about devices and moving files.
Then, the ndiswrapper module (driver) needs to be loaded - there's a way to automate this so that you need not do it after every boot.
modprobe is the command.
Once the module is loaded, your wireless card should function. You'll then have to set up the wireless parameters - ESSID, Mode, encryption, rate, etc. iwconfig is the command, but I'm sure there's a Mandrake GUI as well. KWiFiManager is a GUI in KDE for this.
Finally, you'll need to set the network parameters - ifconfig or the MDK GUI. IP address, DNS, DHCP, gateway, etc. need to be set.
After that, you should be surfing away.
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A Wiki is an instructional web site that not only give you a HOWTO, but allows the community to post their experiences, tips and tricks. The ndiswrapper Wiki is a must-read before trying to install the program.
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To get the latest version of ndiswrapper, you'll need to do something called compiling unless you can find a Mandrake rpm (pre-compiled binary.) Compiling is turning source code - the original program, usually in C language - into binary code that will run on your machine. In order to do that, you need certain tools: a compiler, make tools and the source code for the kernel itself - the underlying foundation of the operating system.
Mandrake does not include kernel source on the CDs, so you'll need to do some searching to get it and it must match the kernel you are running. The command uname -r will tell you your kernel version.
The compiler and other tools needed should be on the CDs. Look for something like "development tools" and install them.
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Use the command line. From a console window (called system console or Konsole or terminal depending on the desktop environment, or CTRL-ALT-F1...6), you can do an amazing array of things, usually more quickly than with a UI.
A complete set of documentation for Linux is included with your system - the man or manual pages.
man command or info command will launch a part of the manual for that command. Up/Down arrow or Page up/down to read through them. Q to quit out of man. Some of the man pages are pretty cryptic, but they will make more sense in time.
man iwconfig will tell you all about wireless commands.
The commands which and whereis will help you find things.
which iwconfig will show you the path to iwconfig - /sbin/iwconfig for example
whereis iwconfig will show you all of the places where iwconfig occurs.
If you're not sure what command to use, try apropos.
apropos wireless lists all of the commands that relate to wireless.
This is a fuzzy kind of search, so it doesn't always give you the exact answer you hoped for.
Tab complete, highlight copy/middle-click paste ... there's so much more.
You're still confused, but on a higher plane.
Hang in there, get a Linux book and read a lot.
Try some things, break some things, try not to reboot to fix things, almost never reinstall, and have fun.