As a parent, I was once told that if children are left to play, then they will happily play all day without getting themselves into any trouble, but if a door or garden gate is forgetfully left open, then children will wander, explore, begin to get into mischief. . . . There are many doors in the Registry, but while some may be opened, thankfully Windows will protect us from destroying the Registry. On a modern operating system, the Windows security model is very robust and will do a very good job at protecting itself from destruction, sometimes despite our own best endeavors to undermine security.