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How to Recover from a Corrupted Registry That Prevents Windows XP from Starting
The information in this article applies to:
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional
Microsoft Windows XP Tablet PC Edition
Microsoft Windows XP Media Center Edition
This article was previously published under Q307545
SUMMARY
This article describes how to recover a Windows XP system that does not start because of corruption in the registry. This procedure does not guarantee full recovery of the system to a previous state; however, you should be able to recover data when you use this procedure.
You can repair a corrupted registry in Windows XP. Corrupted registry files can cause a variety of different error messages. Please refer to the Knowledge Base for articles regarding error messages related to registry issues.
This article assumes that normal recovery methods have failed and access to the system is not available except by using Recovery Console. If an Automatic System Recovery (ASR) backup exists, it is the preferred method for recovery; it is recommended that you use the ASR backup before you try the procedure described in this article.
NOTE: Make sure to replace all 5 of the registry hives. If you only replace a single hive or two, this can cause potential issues, since software and hardware may have settings in multiple locations in the registry.
MORE INFORMATION
When you try to start or restart your Windows XP-based computer, you may receive one of the following error messages:
Windows XP could not start because the following file is missing or corrupt: \WINDOWS\SYSTEM32\CONFIG\SYSTEM
Windows XP could not start because the following file is missing or corrupt: \WINDOWS\SYSTEM32\CONFIG\SOFTWARE
Stop: c0000218 {Registry File Failure} The registry cannot load the hive (file): \SystemRoot\System32\Config\SOFTWARE or its log or alternate
The procedure described in this article uses Recovery Console, System Restore, and lists all the required steps in specific order to ensure that the process completes fully. After you complete this procedure, the system should return to a state very close to the system before the problem occurred. If you have ever run NTBackup and completed a system state backup, you do not have to follow the procedures in parts two and three; you can skip to part four.
Part One
In part one, you boot to the Recovery Console, create a temporary folder, back up the existing registry files to a new location, delete the registry files at their existing location, and then copy the registry files from the repair folder to the System32\Config folder. When you are finished with this procedure, a registry is created that you can use to boot back into Windows XP. This registry was created and saved during the initial setup of Windows XP, so any changes and settings that took place after Setup completes are lost.
To complete part one, follow these steps:
Boot to the Recovery Console.
At the Recovery Console command prompt, type the following lines, pressing ENTER after you type each line:
md tmp
copy c:\windows\system32\config\system c:\windows\tmp\system.bak
copy c:\windows\system32\config\software c:\windows\tmp\software.bak
copy c:\windows\system32\config\sam c:\windows\tmp\sam.bak
copy c:\windows\system32\config\security c:\windows\tmp\security.bak
copy c:\windows\system32\config\default c:\windows\tmp\default.bak
delete c:\windows\system32\config\system
delete c:\windows\system32\config\software
delete c:\windows\system32\config\sam
delete c:\windows\system32\config\security
delete c:\windows\system32\config\default
copy c:\windows\repair\system c:\windows\system32\config\system
copy c:\windows\repair\software c:\windows\system32\config\software
copy c:\windows\repair\sam c:\windows\system32\config\sam
copy c:\windows\repair\security c:\windows\system32\config\security
copy c:\windows\repair\default c:\windows\system32\config\default
Type exit to quit Recovery Console. Your computer will restart.
NOTE: This procedure assumes that Windows XP is installed to the C:\Windows folder. Make sure to change C:\Windows to the appropriate windows_folder if it is a different location.
If you have access to another computer, to save time, you can copy the text in step two, and then create a text file called "Regcopy1.txt" (for example). To create this file, run the following command when you boot into Recovery Console:
batch regcopy1.txt
The Batch command in Recovery Console allows for all the commands in a text file to be sequentially processed. When you use the batch command, you do not have to manually type as many commands.
Part Two
To complete the procedure described in this section, you must be logged on as an administrator, or an administrative user (a user who has an account in the Administrators group). If you are using Windows XP Home Edition, you can log on as an administrative user. If you log on as an administrator, you must first start Windows XP Home Edition in Safe mode. To start the Windows XP Home Edition computer in Safe mode, follow these steps.
NOTE: Print these instructions before you continue. You cannot view these instructions after you restart the computer in Safe Mode. If you use the NTFS file system, also print the instructions from Knowledge Base article Q309531, which is referenced in Step 7.
Click Start, click Shut Down (or click Turn Off Computer), click Restart, and then click OK (or click Restart).
Press the F8 key.
On a computer that is configured to start to multiple operating systems, you can press F8 when you see the Startup menu.
Use the arrow keys to select the appropriate Safe mode option, and then press ENTER.
If you have a dual-boot or multiple-boot system, use the arrow keys to select the installation that you want to access, and then press ENTER.
In part two, you copy the registry files from their backed up location by using System Restore. This folder is not available in Recovery Console and is normally not visible during normal usage. Before you start this procedure, you must change several settings to make the folder visible:
Start Windows Explorer.
On the Tools menu, click Folder options.
Click the View tab.
Under Hidden files and folders, click to select Show hidden files and folders, and then click to clear the Hide protected operating system files (Recommended) check box.
Click Yes when the dialog box is displayed that confirms that you want to display these files.
Double-click the drive where you installed Windows XP to get a list of the folders. If is important to click the correct drive.
Open the System Volume Information folder. This folder appears dimmed folder because it is set as a super-hidden folder.
NOTE: This folder contains one or more _restore {GUID} folders such as "_restore{87BD3667-3246-476B-923F-F86E30B3E7F8}".
NOTE: You may receive the following error message:
C:\System Volume Information is not accessible. Access is denied.
If you get this message, see the following Microsoft Knowledge Base article to gain access to this folder and continue with the procedure:
309531 How to Gain Access to the System Volume Information Folder
Open a folder that was not created at the current time. You may have to click Details on the View menu to see when these folders were created. There may be one or more folders starting with "RPx under this folder. These are restore points.
Open one of these folders to locate a Snapshot subfolder folder; the following path is an example of a folder path to the Snapshot folder:
C:\System Volume Information\_restore{D86480E3-73EF-47BC-A0EB-A81BE6EE3ED8}\RP1\Snapshot
From the Snapshot folder, copy the following files to the C:\Windows\Tmp folder:
_REGISTRY_USER_.DEFAULT
_REGISTRY_MACHINE_SECURITY
_REGISTRY_MACHINE_SOFTWARE
_REGISTRY_MACHINE_SYSTEM
_REGISTRY_MACHINE_SAM
Rename the files in the C:\Windows\Tmp folder as follows:
Renname _REGISTRY_USER_.DEFAULT to DEFAULT
Renname _REGISTRY_MACHINE_SECURITY to SECURITY
Rename _REGISTRY_MACHINE_SOFTWARE to SOFTWARE
Rename _REGISTRY_MACHINE_SYSTEM to SYSTEM
Rename _REGISTRY_MACHINE_SAM to SAM
These files are the backed up registry files from System Restore. Because you used the registry file created by Setup, this registry does not know that these restore points exist and are available. A new folder is created with a new GUID under System Volume Information and a restore point is created that includes a copy of the registry files that were copied during part one. This is why it is important not to use the most current folder, especially if the time stamp on the folder is the same as the current time.
The current system configuration is not aware of the previous restore points. You need a previous copy of the registry from a previous restore point to make the previous restore points available again.
The registry files that were copied to the Tmp folder in the C:\Windows folder are moved to ensure the files are available under Recovery Console. You need to use these files to replace the registry files currently in the C:\Windows\System32\Config folder. Recovery Console has limited folder access and cannot copy files from the System Volume folder by default.
NOTE: The procedure described in this section assumes that you are running your computer with the FAT32 file system.
Part Three
In part three, you delete the existing registry files, and then copy the System Restore Registry files to the C:\Windows\System32\Config folder:
Boot to Recovery Console (or by using a Windows 98 Boot Disk).
At the command prompt, type the following lines, pressing ENTER after you type each line:
del c:\windows\system32\config\sam
del c:\windows\system32\config\security
del c:\windows\system32\config\software
del c:\windows\system32\config\default
del c:\windows\system32\config\system
copy c:\windows\tmp\software c:\windows\system32\config\software
copy c:\windows\tmp\system c:\windows\system32\config\system
copy c:\windows\tmp\sam c:\windows\system32\config\sam
copy c:\windows\tmp\security c:\windows\system32\config\security
copy c:\windows\tmp\default c:\windows\system32\config\default
NOTE: Some of the preceding command lines may be wrapped for readability.
Type exit to quit Recovery Console. Your computer restarts.
NOTE: This procedure assumes that Windows XP is installed to the C:\Windows folder. Make sure to change C:\Windows to the appropriate windows_folder if it is a different location.
If you have access to another computer, to save time, you can copy the text in step two, and then create a text file called "Regcopy1.txt" (for example).
Part Four
Click Start, and then click All Programs.
Click Accessories, and then click System Tools.
Click System Restore, and then click Restore to a previous Restore Point.
REFERENCES
For additional information about using Recovery Console, click the following article numbers to view the articles in the Microsoft Knowledge Base:
307654 HOW TO: Install and Use the Recovery Console in Windows XP
216417 HOW TO: Install the Windows XP Recovery Console
240831 HOW TO: Copy Files from Recovery Console to Removable Media
314058 Description of the Windows XP Recovery Console
For additional information about System Restore, click the following article numbers to view the articles in the Microsoft Knowledge Base:
306084 HOW TO: Restore the Operating System to a Previous State in Windows XP
261716 System Restore Removes Files During a Restore Procedure
