LinuxQuestions.org - Dificulty Installing video driver

Hi everyone and thank you for assisting me:

It's my second day at Linux or whatever I should call BackTrack. I must say I always though Linux as a hacker/professional oriented OS but never gave a try until last day. As you probably guess, I'm having some serious problems as a Windows user. My main issue is getting to work my onboard gpu. This is what I have done so far:

. Messing everything up
. Got Nvidia Package for my legacy GPU (a .run file)
. Managed to start its installation (learn how to use comm... "Terminal" a bit
. Closed X server ( guess that's the way you call OS interface)
. Wait a second... I closed X server before doing install

So it was working until Nvidia installer claims something about "not precompiled kernel" . Searched in Nvidia's FTP but found nothing so it failed

. Googled what "compiling" a kernel means.
. Compiled Kernel (system said Kernel was "ready" )
. Start installing. Failed anyway.
. "Updated" ... something. Repository (?

I dont even know how apt-get works but look like you Linux users have a place where programs are "always available" through a web server and accesible through command... shit... through Terminal. Is that what you call repository? Kinda ftp ?
Whatever. Seems that BackTrack repository is no longer available. I get many "fetching" messages. You probably now wonder how I updated repositories then. Well I googled and copy&paste ever single command I found.

Well, back to my driver. Stuck. How should I proceed now?
Can I "change" my kernel to another Linux distribution one? One with available repositories. Maybe that could work but I dont wanna make my system unusable. At least not till I now how to recover it >.<

I'm new to this world but it's exciting. My very first computer came with Linux or Xandros. 2 days later it got XP.

BTW my keyboard is so lagging after back from a suspended state. It works fine after a clean reboot. And I think yesterday it fixed itself after I went a few hours.

So my BT version is 5r3 x86 . Onboad gpu is nforce 630a/720 . Terminal said something about nouveau ?
Other question. How in the hell you install a packed file?

http://s21.postimg.org/frn3p895v/Screenshot.jpg

Thank you all! In advance