System Restore is a component of Microsoft's Windows Me, Windows XP, Windows Vista and Windows 7 operating systems that allows for the rolling back of system files, registry keys, installed programs, etc., to a previous state in the event of malfunctioning or failure.

The Windows Server operating system family does not include System Restore. The System Restore built into Windows XP can be installed on a Windows Server 2003 machine, although this is not supported by Microsoft.

For more information of restore points click here. courtesy of Wikipedia.