Windows XP file is missing or corrupt problem and solutions

Solving a Windows XP Boot Problem

My computer has developed an interesting problem that I can't resolve. In short, when the system boots, I get the error message: "Windows XP could not start because the following file is missing or corrupt: \WINDOWS\SYSTEM32\CONFIG\SYSTEM." Can you help solve this problem?

I've seen this exact problem several times. The problem is a corrupt registry. The solution can be complex and laborious but usually solvable. Fixing the problem works best on a standard XP version and not an OEMinstalled version. I've fixed the registry on OEM installations, but the steps shown here may or may not work on some of these custom installations.

Although the error message states that the system file is corrupt or missing, that doesn't mean that the registry damage is restricted to the System component. The registry has five major components?SAM, Security, Software, Default, and System—and you need to change all five. Start by crossing your fingers.

First, you need to boot to an XP CD-ROM and at the Welcome to Setupscreen, press R to start the Recovery Console. A message will ask you to pick the version of Windows you want to log on to. You'll see a directory listing such as 1: c:\windows (if you're running only one copy of XP on the system). Type in 1 and press enter. If you're running multiple copies of XP, type the number of the one you need to fix. Log on with your Administrator password.

The fix involves making a temporary folder and copying the current registry hives to this temporary folder, deleting the old hives in the current registry, then repairing the registry. Here's an outline of the procedure:

At the Recovery Console command prompt, type

md tmp 

and press Enter to make the temporary folder. Then type each of the following lines, pressing enter after each one.

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

Exit  the Recovery Console and the computer will restart. (Don't boot back into the Recovery Console.) Now, you can restore your system to the way it was before the registry became corrupted. To do so, you need to find a restore point. In the System Volume Information folder, you'll see a group of folders starting with RPx.

 These folders contain the system restore points. You need to open one of these folders to locate a snapshot subfolder. The following path is an example of a path to a snapshot folder on my XP system: C:\system volume information\_re store{98539E66-D85A-41E7-ACFDAE0F6CD9DE9}\RP586\snapshot. Other RPx folders exist on a system, but I use the one with the highest x value, which will have the latest hardware installations and hives.