i was searching over internet resolution for my problem with BT5 and did not success in resolving.
So i will try here to find solution from your help
Anyway, i just installed BackTrack 5 x64 KDE and after install i did remove cache files and install (from nVidia website) drivers, now when i try to start X i got first screen with KDE loading and after that he crashed and report error.
Here is my xorg.conf: http://pastebin.com/2FZ4Jrt7
and log of X: http://pastebin.com/D7uH9F0y
I think that`s all what you need for troubleshooting if something i miss, please request.
Thank you for support!