Define, cannot navigate? Do you mean that you can't find
the network, can find the network but cannot connect, or can connect
but can't use the network (like traffic doesn't get through even
though you are connected)?

> This means that you have some doubts
>
> * How do I know if my wireless card is installed?
> * If the driver installed how to surf the web?
> * If the driver are not installed how to install and configure the
> Internet?
> * I found this driver (
> www.broadcom.com/support/802.11/linux_sta.php) and I do not
> know how
> to install

You need to see if Debian is actually picking up the card and
attaching a driver to it, I'm not a big Debian user but I do use
Ubuntu so the commands should be at least similar. I always tell
people if they don't know if the wireless device has a driver for it,
use this command.

$ sudo lshw -C network

This is going to list your network devices and stats about them, in
particular, you are looking for a line similar to this:

configuration: broadcast=yes driver=ndiswrapper+awgna54
driverversion=1.45+Ativa,07/07/2006,4.1.2.133 ip=192.168.100.100
latency=128 link=yes
maxlatency=28 mingnt=10 module=ndiswrapper multicast=yes
wireless=IEEE 802.11b

In that line you'll be looking for "driver=", where it will say
unclaimed if no driver is attached, otherwise it'll list the driver
being used. In the case of my example it is my laptops Atheros 54g
chipset on my laptops PCMCIA card.

I did a write up on ways to get it working for using the command line
and the server CD, but the commands should be similar (the laptop I
did the write up for could not handle the live CD due to graphics card
issues).

compusolvency.blogspot.com/.../...m-server-cd.html

> My wireless card is: Broadcom Corporation BCM4312 802.11a/b/g (rev 01)
> (lspci result)
>
> Another problem is that I find with my video card, where the same
> way I do
> the following questions
>
> * How do I saberse the card is installed?
> * If the video card installed, how to enable the 3D graphics
> capabilities in Debian
> * If the video card are not installed as I install it? I tried
> using
> ATI's own driver, but without success. = (
>
> My video card is: ATI Technologies Inc RS690M [Radeon X1200 Series]
> (lspci
> result)

Here I am more out of my element, google is your friend though all I
can recommend here (because all my systems that I wanted to put 3D on
worked pretty much out of the box for me) is do google "Enable 3D ATI
Radeon X1200 Series Debian", it should at least get you started on web
searching. I know that is not much help, but best I personally know
to do.