I'm running 10.4.11, and when I try to install x11 with the optional installs, it can't install. I had it installed before, and since it was a shared computer, my mom, who doesn't know much about computers, deleted it to save some disc space. And the x11 was installed in 10.3 I believe, and then it was upgraded. How can I get rid of it so that I can reinstall it?