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Article ID: 322756 - Last Review: September 23, 2011 - Revision: 9.0
How to back up and restore the registry in Windows XP
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SUMMARY
This article describes how to back up the registry in Windows XP.

For information about how to back up the registry in Windows Vista and in
Windows 7, please see the links at the end of the article.
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Back up the registry
Guided Help to export registry keys and to back up the registry in Windows
XP Guided Help is available to export registry keys and to back up the
registry. Guided Help can automatically perform the steps for you.

The actions that this Guided Help performs cannot be undone after Guided
Help is finished.

Requirements to install and to use this Guided Help
You must be logged on to Windows by using a computer administrator account
to install and to use this Guided Help.
You must be running an English version of Windows XP Home Edition, Windows
XP Professional, Windows XP Media Center Edition, or Windows XP Tablet PC
Edition to install and to use this Guided Help.
You must first download Guided Help. To start, click the following link:
Download Guided Help

Manual steps to back up the registry in in Windows XP
Click Start, click Run, type %SystemRoot%\system32\restore\rstrui.exe, and
then click OK.
On the Welcome to System Restore page, click Create a restore point, and
then click Next .
[CUT!]

I had to reply because System Restore won't be able to help you if the
system is unbootable even in Safe Mode due to registry corruption. e.g. the
SYSTEM registry hive file is corrupted.

The sure way to restore the registry is by booting into the Recovery Console
(if you've already installed it), or a separate Windows installation (e.g.
Windows PE). Then restore the registry files from that system. If the files
are backupped using System Restore, copy the files from one of the subfolder
in "C:\System Volume Information" folder, into "C:\Windows\System32\Config"
folder. Otherwise, use your registry backup+restore tool (e.g. ERUNT, etc.).