I'm a confused noob...

Using Backtrack 5 R2 32 bit KDE installed on a 4 GB USB stick. I'm running it on a Lenovo T410i. It boots to the Backtrack wallpaper with a command line window in the middle at the root prompt. However, there doesn't seem to be a window manager running - I have no desktop, no mouse, no icons or windows. I tried startx, but the screen goes black and the capslock blinks. I also tried the 64 bit iso, but it won't boot - it goes directly to a blank screen with blinking capslock.

I can successfully boot ubuntu 11.10 desktop installed on the same USB stick and everything works fine.

Any ideas?