The ASR feature, which replaces the Emergency Repair Disk for Windows XP and Windows Server 2003, allows you to restore the operating system to a previous state so that you can start Windows XP Professional or Windows Server 2003 when other recovery methods do not work.

Microsoft recommends using System Restore, which saves only incremental changes and lets you start Windows XP Professional in normal or safe mode, before resorting to ASR. For more information about ASR or System Restore, refer to your Microsoft documentation.