Hi I've been having big problems trying to solve my problem. I've checked all the posts related, tried all the solutions and still I didn't get anything, so I'm sharing my problem and hope for someone to have the solution. I installed Windows XP with BootCamp and it was working fine. But then the HD space of the windows partition was too small and I needed more space. So what I did was erase the partition with the Disc Utility. But before that I wanted to test the Parallels to see if the windows 7 would work fine with it. It installed easily but I didn't like the performance of it, so I just erased it with the AppCleaner. Then I erased the BootCamp partition with Disc Utility. No problem. But when I tried to use the Boot Camp Assistant again, it only gave me the message: "The Disk Cannot Be Partitioned Because Some Files Cannot Be Moved" I've checked the forums and it was said that probably if I use iDefrag, it would solve my problem. Once I did it, I still got the same message. Then I decided to repair the dic, so I did the verification and clicked on Repair Disc Permitions and I've got this message: -The file SUID "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent" was modified and cannot be repaired. Then I decided to reboot the whole system inserting the installation disc and pressing the C button, but all I get is a white screen and no response. And sometimes the Macbook not even start properly (also having only the white screen and no response), so I need to press the Option button till the Mac HD icon appears and I can access the computer. And now I really without any option and I wanted to install the windows. Is there anyone that can help me?