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How To recover froma corrupted registry that prevents windows xp from starting



Manual steps to recover a corrupted registry that prevents Windows XP from starting.

Part one
In part one, you start 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 have finished this procedure, a registry is created that you can use to start Windows XP. This registry was created and saved during the initial setup of Windows XP. Therefore any changes and settings that occurred after the Setup program was finished are lost.

To complete part one, follow these steps:
1. Insert the Windows XP startup disk into the floppy disk drive, or insert the Windows XP CD-ROM into the CD-ROM drive, and then restart the computer. Click to select any options that are required to start the computer from the CD-ROM drive if you are prompted to do so.
2. When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
3. If you have a dual-boot or multiple-boot computer, select the installation that you want to access from the Recovery Console.
4. When you are prompted to do so, type the Administrator password. If the administrator password is blank, just press ENTER.
5. 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

6. 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 on your system.

If you have access to another computer, to save time, you can copy the text in step five, and then create a text file called "Regcopy1.txt" (for example). To use this file, run the following command when you start in Recovery Console:

batch regcopy1.txt

With the batch command in Recovery Console, you can process all the commands in a text file sequentially. When you use the batch command, you do not have to manually type as many commands.

Note Print these instructions before you continue. You cannot view these instructions after you restart the computer in Safe Mode.

Note: The Next step is to make sure you have access to the System Volume Information folder:
To gain access to the System Volume Information folder, use the steps in the appropriate section.

Microsoft Windows XP Professional or Windows XP Home Edition Using the FAT32 File System
1. Click Start, and then click My Computer.
2. On the Tools menu, click Folder Options.
3. On the View tab, click Show hidden files and folders.
4. Clear the Hide protected operating system files (Recommended) check box. Click Yes when you are prompted to confirm the change.
5. Click OK.
6. Double-click the System Volume Information folder in the root folder to open it.

Windows XP Professional Using the NTFS File System on a Domain
1. Click Start, and then click My Computer.
2. On the Tools menu, click Folder Options.
3. On the View tab, click Show hidden files and folders.
4. Clear the Hide protected operating system files (Recommended) check box. Click Yes when you are prompted to confirm the change.
5. Click OK.
6. Right-click the System Volume Information folder in the root folder, and then click Sharing and Security.
7. Click the Security tab.
8. Click Add, and then type the name of the user to whom you want to give access to the folder. Choose the account location if appropriate (either local or from the domain). Typically, this is the account with which you are logged on. Click OK, and then click OK again.
9. Double-click the System Volume Information folder in the root folder to open it.

Windows XP Professional and Home Edition using the NTFS File System on a Workgroup or Standalone Computer
1. Click Start, and then click My Computer.
2. On the Tools menu, click Folder Options.
3. On the View tab, click Show hidden files and folders.
4. Clear the Hide protected operating system files (Recommended) check box. Click Yes when you are prompted to confirm the change.
5. Clear the Use simple file sharing (Recommended) check box.
6. Click OK.
7. Right-click the System Volume Information folder in the root folder, and then click Properties.
8. Click the Security tab.
9. Click Add, and then type the name of the user to whom you want to give access to the folder. Typically, this is the account with which you are logged on. Click OK, and then click OK again.
10. Double-click the System Volume Information folder in the root folder to open it.

NOTE: The System Volume Information folder is now accessible in normal mode to users of Windows XP Professional and Home Edition.

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.

1. Click Start, click Shut Down (or click Turn Off Computer), click Restart, and then click OK (or click Restart).
2. 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.
3. Use the arrow keys to select the appropriate Safe mode option, and then press ENTER.
4. 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 copied the registry files from their backed up location by using System Restore. The System Volume Information folder is not available in Recovery Console and is generally not visible during typical usage.
5. When your system has started open the root drive (The Drive that contains your system files) and open the System Volume Information folder.
Note This folder contains one or more _restore {GUID} folders such as "_restore{87BD3667-3246-476B-923F-F86E30B3E7F8}".

6. 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.
7. Open one of these folders to locate a Snapshot subfolder. 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
8. 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
9. Rename the files in the C:\Windows\Tmp folder as follows:

Rename _REGISTRY_USER_.DEFAULT to DEFAULT
Rename _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 that the Setup program created, 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. Therefore, 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 must have 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 make sure that the files are available under Recovery Console. You must use these files to replace the registry files currently in the C:\Windows\System32\Config folder. By default, Recovery Console has limited folder access and cannot copy files from the System Volume folder.

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:
1. Start Recovery Console.
2. 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 mp\software c:\windows\system32\config\software
copy c:\windows mp\system c:\windows\system32\config\system
copy c:\windows mp\sam c:\windows\system32\config\sam
copy c:\windows mp\security c:\windows\system32\config\security
copy c:\windows mp\default c:\windows\system32\config\default

Note Some of these command lines may be wrapped for readability.

3. 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 three, and then create a text file called "Regcopy2.txt" (for example). To use this file, run the following command when you start in Recovery Console:

batch regcopy2.txt

Part Four
1. Click Start, and then click All Programs.
2. Click Accessories, and then click System Tools.
3. Click System Restore, and then click Restore to a previous RestorePoint.
4. Follow the prompts, your computer should now run as it did before the registry error.

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