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Good judgment comes from experience, and a lot of that comes from bad judgment.
There are 170,000,000,000,000,000,000,000,000 ways to play the ten opening moves in a game of chess. Most of this is done behind the scenes when you install a program. You can add you own personal touches. Windows 98 backups your registry with each reboot, so that you have the five most recent registries stored. You'll see the five backups there.