This type of error usually indicated that the pc has refused to start because of a corruption within the registry. The following should remedy the problem. However, it is important that you replace all five registry hives. Simply replacing one or two could, potentially, cause other problems. NOTE You should not use the method two set of instructions below if your system has an OEM (Original Equipment Manufacturer) copy of Windows XP. Doing so will render your operating system inoperable. OEM installations create passwords and user name that did not previously exist. Therefore, in your own interest, these instructions will not remedy the problem. The easiest option with OEM copies of XP is to reinstall XP using the manufacturer’s recovery disks. Easy Method 1/ Restart your PC 2/ Keep tapping the F8 Button until a menu appears 3/ When the menu appears use the UP and DOWN arrow keys to select the ‘Last known good configuration’ option. 4/ Once selected press Enter 5/ Your PC should now reinstall the ‘last know good configuration file’ 6/ Restart your PC and see if the problem has been solved 7/ If it hasn’t go on to the Harder Method below. This fix was contributed by Peter Hayes.
While this fix is not 'guaranteed' to repair the problem it is worth going through the procedure before stepping up to the harder method.
1/ Insert the Windows XP CD into the CD-ROM and restart your pc
2/ At the 'Welcome to Setup' screen press R to start the recovery Console
3/ The Recovery Console will now open and the list of Windows installations will appear
4/ As you only have one installation on your PC you need to press the number which is relevant to your installations location. This, obviously, will typically be 1
5/ When requested type in your Administrator password. If you haven't set an administrator password, then simply press Enter
6/ The Recovery Console command prompt window will now appear
7/ At the Recovery Console command prompt type: CHKDSK
8/ If CHKDSK reports file sectors run CHKDSK again only this time type CHKDSK /R instead
9/ Fixing bad sectors on the hard disk can take some time, so please be patient.
10/ After CHKDSK has finished, remove the XP CD from the CD-ROM and reboot
11/ Hopefully your PC should boot as normal.
Harder Method
Step On 1/ Insert the Windows XP CD into the CD-ROM and restart your pc 2/ At the ‘Welcome to Setup’ screen press R to start the recovery Console 3/ The Recovery Console will now open and the list of Windows installations will appear 4/ As you only have one installation on your PC you need to press the number which is relevant to your installations location. This, obviously will typically be 1 5/ When requested type in your Administrator password. If you haven’t set an administrator password, then simply press Enter 6/ The Recovery Console command prompt window will now appear 7/ At the Command prompt type the following, pressing Enter after you have typed 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 8/ Now type Exit to exit the recovery console 9/ Finally restart your pc Step Two 10/ When the PC restarts log on as Administrator. if you are using Windows XP Home you can only log on as Administrator via Safe Mode. 11/ The next step is to copy the registry files from their backed up location using system restore. However, before you can begin you need to set the folder options in Windows Explorer to Show Hidden Files and Folders 12/ Open Windows Explorer 13/ Click the Tools option on the main toolbar 14/ From the drop down menu click on Folder options 15/ In the Folder options window click the View tab 16/ Look down the file list until you come to a section marked Hidden Files and Folders 17/ Click on the Radio button on the left of the option Show hidden Files and Folders to enable this option 18/ Next move down two lines and remove the check mark next to the option Hide Protected operating system files (Recommended) 19/ You will receive a message informing you that editing or deleting these files could cause damage to your system. Click Yes to confirm that you want to display these files. 20/ From the folder/directory list in Windows explorer click on the drive where you installed Windows XP 21/ Open the System Volume Information folder (The folder appears dimmed) If you receive a System volume Information is not accessible. access denied Error message see Microsoft Knowledgebase Article 309531 22/ Inside you will find one or more folders that look something like this "_restore{87BD3667-3246-476B-923F-F86E30B3E7F8}". 23/ If the folders are displayed as icons or thumbnails click the View option on the main toolbar and click on Details to give a more detailed view of the files 24/ Select a file that was not created at the current time and that starts with RPx (these are Restore Points) 25/ Open one of these folders and look for a Snapshot folder - for example: C:\System Volume Information\_restore{D86480E3-73EF-47BC-A0EB-A81BE6EE3ED8}\RP1\Snapshot 26/ From this snapshot folder copy the following files to C:\Windows\tmp folder 27/ Now rename the files 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
Step Three 28/ You now have to delete the existing registry files and copy the system restore registry files to the C:\Windows\System32\Config folder: You can do this either by using Recovery Console or (if you file system is FAT32) by using a Windows 98 Start Up Disk) Whichever method you use you will be presented with a command prompt. At the command prompt type the following, remembering to press Enter after you have typed 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 29/ Now type the following, pressing Enter after you have typed each line: 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 Please Note When inputting the above copy information, if you get a 'file not found' error try adding a .bak extension to each copy operation, as follows: You should only add the .bak extension if you get the 'file not found' error message, otherwise follow the instructions at step 29. 30/ Finally Exit Recovery Console and Restart your PC (If you are using the Windows 98 startup disk simply press CTRL-ALT-DEL to restart your pc Step Four 31/ After your PC has rebooted click the Start button followed by All Programs 32/ From the All Programs menu click Accessories 33/ From the Accessories drop down menu click on System Restore 34/ From the System Restore window click on the Restore to a Previous Restore Point option and restore your pc to a previous restore point | 
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