I want to lower the resolution from 1024x768 to 800x600. Once I have KDE or Flux started, I attempt to make the change. However, once I do this, the screen becomes extremely scrambled (threedweb.com/backtrack.png). I cannot see anything on the screen - typing "startx" reloads X, but back with the higher resolution. I am using a MacBook running a live version of Backtrack for now. Would installing the software make a difference? I thought there could be an issue with the video card drivers.

Another note, I am trying to use Parallels Desktop. I think this could be the issue, but I wasn't sure if I should pursue the answer here or through their forums. Any guidance on this subject will be greatly appreciated.