Ok so I am trying to install mavericks on my dell latitude d830. It has the NVIDIA 140m graphics. I followed the Pre Installation Instructions to get my USB prepared, then began following the Installation instructions. It loads up and gets to the point where you select your language. I selected English, then pushed next. The next window that pops up says "The OS X Installation couldn't be completed." In the background, it shows an installer log. I'm not sure what is going wrong as I am following the instructions. Thanks for your help!