problem with BackTrack

[akdmnt]

Hello, I need your help. I have installed virtual box 2.2.4 in Windows Vista Home Premioum and I am trying to run BackTrack. I also have XUBUNTU as guest in the Virtual Box and runs properly! I do the same steps and same settings but I face the following problem when I am trying to run BackTrack. When I start the virtual machine everything is fine. It loads the first screen of backtrack where you choose which mode you want to run. From all the choices the only one I can;t use is the "BT3 graphics mode (KDE)"and it is the one I need. When I choose this mode what I get is a black screen that seems to try load BackTrack, and this black screen flashes and turns from bigger to smaller all the time without doing anything else...Any help or ideas?? ...

[Perryg]

Have you tried to run it with a different desktop and install the guest additions?
Are there other desktops included? Must it run in KDE?
Does it run properly from the CD? Backtrack was designed to run from the CD from what I remember (I actually installed it once).