You have two options
1. To include the no3d cheatcode in /mnt-system/boot/syslinux/syslinux.cfg -place it in the the line that loads your knoppix - adrian or knoppix or both.

2.Second option is to use openbox instead of compiz and metacity by editing /etc/xdg/lxsession/LXDE/desktop.conf the line window_manager=compiz should be window_manager=openbox-lxde.

I would personally recommend the second option.It gives you a good control over the looks and you get rid of this annoying compiz for good.