Thanks Jamin4U for your input. I guess I'm having trouble communicating my question to get the type answer I'm looking for. In the CCleaner "tour" for newcomers, in the section (#5) relating to the Registry, it states, "That is why CCleaner includes a complete backup option, so in the rare event you remove something that you later need - you will have a backup to restore from. To use, simply press the "Scan for Issues" button and once completed press the "Fix Selected Issues" button. You will be prompted to backup and helped throughout the process." It is this last sentence that I want to know about. Exactly what happens? Can you give me sort of a step-by-step sequence of what transpires in this system registry scan -- and what you do if you want to restore something the CCleaner "fixes" if you should need to do so. Thanks!