The Intel driver should be installed by default on Backtrack.
Since you state that you are new to Linux, I would recommend to not use Backtrack at all. Backtrack is a specialized distribution, made from network and security experts for their work. It is not intended to be a desktop system.
While Backtrack may give some people the "1337-H4x0r" feeling it is not a distro that is aimed at the beginner, I would rather recommend to switch to Mint, PCLinuxOS or Mepis, may be Ubuntu (but I am not really recommending it).