I'm trying to install Backtrack 5 (R3) on virutalbox, but every time I try to enter text mode it starts loading somethings and then eventually gives me this message:

"This kernel requires an x86-64 CPU, but only detected an i686 CPU.
Unable to boot - please use a kernel appropriate for your CPU."

Here are my system specs:
Model: Windows 7 RTM v2.0-x64
Processor pentium(R) Dual-Core CPU E5200 @ 2.50GHz 2.50GHz
Installed memory (RAM): 2,00 GB
system type: 64-bit Operating System.

I used these two backtrack os'ses to try to install it but i got the same message on both,
(Don't know the difference between GNOME and KDE tho.)

If anyone could explain to me what i'm doing wrong or how to fix this it would be greatly appreciated.