I've a backtrack 5 r1. I've installed the 32bit version because the 64bit version was causing me problems (my computer is an acer 64bit).
I've installed the nvidia driver for my gt540m but it gets:

(==) Using config file: "/etc/X11/xorg.conf"
(==) Using config directory: "/usr/lib/X11/xorg.conf.d"
(EE) No devices detected.

Fatal server error:
no screens found
so i always have to move the xorg.conf to be able to use graphic interface (without nvidia).

i've installed the driver in many ways for example:
prepare-kernel-sources
cd /usr/src/linux
cp -rf include/generated/* include/linux/
cd
chmod +x nvidiafilename
logged out and
sh nvidiafilename
which driver should i use? the 32bit or the 64bit version? how do i properly use the driver? thanks.