Performing a Repair Install
There are occasions when a system will become unstable and the operating system is suspected as a likely culprit. When this happens, you can attempt what is known as a repair install. The concept behind a repair install is simple: You want to fix the operating system but keep all of your user and data files. This is accomplished by running a repair install of the operating system over the operating system already running.
Windows XP includes an option to press R during installation to repair the operating system. You see this as soon as you boot from the installation media as an option in the first text-based screen of the installation.
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