... systems is theoretically impossible in Mac OS X, and therefore the need to perform a clean install is almost completely eliminated. That's the theory, anyway. In fact, somehow or other, things ... one, uncontaminated by the detritus left behind by you and your software programs. In general, though, you and your software can't invade the Mac OS X System folder. The kind of gradual ... Mac OS X. And thanks to the clean install ("Archive and Install") option, you can—without having to erase the hard drive first. Start by following steps 1 through 3 in " ;The Basic...