Sorry that earlier I forgot my usual...
Welcome to LQ!
however, qwijibow is absolutely correct. This question
is asked quite frequently. You should do 3 things:
(1) download, read, maybe print, and follow the file of
instructions from Nvidia;
(2) search our forums, especially this Debian forum;
this thread might be a good starting place
(3) read
How To Ask Questions The Smart Way
by Eric S. Raymond and Rick Moen;
and the LQ brief version
How To Ask A Question
Just a word to the wise. If you're going to run a Linux
operating system, you're going to need help from places
such as this. The younger, less experienced people will
give you an answer (usually their guess) at the drop of a
hat. The older, more experienced guys won't look at the
posts you make if it's like this one. You don't really tell
any errors, what steps you took, or much about your
system.
When a "guru" needs to ask you questions just to get to
first base to help you, 99 out of 100 will skip your thread.
I'm still wet behind the ears, and just want to help you...