Windows XP’s System Restore lets you restore your computer to a previous time if a problem occurs. To accomplish this feat, System Restore continuously monitors your system looking for significant changes to the operating system, such as an application or driver installation procedure, automatically creating a restore point when it detects an impending change.
System Restore will also create restore points every 24 hours. Restore points are essentially snapshots of your system state, which comprises crucial system files, including certain parts of the registry. System Restore maintains multiple restore points, which gives you the choice of restoring your computer to any number of previously saved states.
Here are 10 things you should know about Windows XP's System Restore tool.