I am trying to install Windows on my Mac via Boot Camp. I partitioned 20GB of space for the installation. The disc I'm using came with a Dell computer I had for a while. Microsoft Windows XP Professional Service Pack 3 is the version of Windows that is on the disc. It says on it, "Operating System" "Already installed on your computer". So the disk is a re-installation CD. I figured that it wouldn't matter if I used that cause it had all of the necessary files on it to run Windows. I put the disc in and it started installing and it looked like it was installing just fine and then at the very end of the installation there was a windows error message that said there was an error installing. The Mac reset and went back to the blank page I had when first started the installation. I had a hard time ejecting but I eventually got the disk out and my Mac went back to running normally. Did Windows not install correctly because I am using a re-installation version of Windows? Thank you in advance for any help.