I have 6G of RAM and enable "pae" as it says in the link
http://www.backtrack-linux.org/wiki/index.php/PAE_kernel
also check
joss >> root @: ~ # cat / boot/config-3.2.6 | grep HighMem
#...
Type: Posts; User: bl455; Keyword(s):
enable kernel pae error
I have 6G of RAM and enable "pae" as it says in the link
http://www.backtrack-linux.org/wiki/index.php/PAE_kernel
also check
joss >> root @: ~ # cat / boot/config-3.2.6 | grep HighMem
#...