INTRODUCTION

This article describes how to analyze the log files that the Microsoft Windows Resource Checker (SFC.exe) program generates in Windows.

Overview

You can use the SFC.exe program to help you troubleshoot crashes that occur in the user mode part of Windows. These crashes may be related to missing or damaged operating system files.

The SFC.exe program performs the following operations:

  • It verifies that non-configurable Windows system files have not changed. Also, it verifies that these files match the operating system's definition of which files are expected to be installed on the computer.
  • It repairs non-configurable Windows system files, when it is possible.

How to analyze the log file that the SFC.exe program generates

The SFC.exe program writes the details of each verification operation and of each repair operation to the CBS.log file. Each SFC.exe program entry in this file has an [SR] tag. The CBS.log file is located in the %windir%\Logs\CBS folder.

Note: The Windows Modules Installer service also writes to this log file. (The Windows Modules Installer service installs optional features, updates, and service packs.)

You can search for [SR] tags to help locate SFC.exe program entries. To perform this kind of search and to redirect the results to a text file, follow these steps:

  1. Select Start, type cmd in the Start Search box, right-click cmd in the Programs list, and then click Run as administrator.
  2. Type the following command, and then press ENTER:

findstr /c:"[SR]" %windir%\logs\cbs\cbs.log >sfcdetails.txt

NOTE: The Sfcdetails.txt file includes the entries that are logged every time that the SFC.exe program runs on the computer.

How to interpret the log file entries

The SFC.exe program verifies files in groups of 100. Therefore, there will be many groups of SFC.exe program entries. Each entry has the following format:  date, time, entry type, details

 

The following sample excerpt from a CBS.log file shows that the SFC.exe program did not identify any problems with the Windows system files:

 

<date> <time>, Info   CSI    00000006 [SR] Verifying 100 (0x00000064) components

<date> <time>, Info   CSI    00000007 [SR] Beginning Verify and Repair transaction

<date> <time>, Info   CSI    00000009 [SR] Verify complete

<date> <time>, Info   CSI    0000000a [SR] Verifying 100 (0x00000064) components

<date> <time>, Info   CSI    0000000b [SR] Beginning Verify and Repair transaction

<date> <time>, Info   CSI    0000000d [SR] Verify complete

<date> <time>, Info   CSI    0000000e [SR] Verifying 100 (0x00000064) components

<date> <time>, Info   CSI    0000000f [SR] Beginning Verify and Repair transaction

<date> <time>, Info   CSI    00000011 [SR] Verify complete

<additional entries>

<date> <time>, Info   CSI    00000011 [SR] Verify complete

Note: Although the log file entry states that the SFC.exe program is repairing the changed file, no actual repair operation occurs when a file is verified.

The following table lists other messages that may be logged in the SFC.exe program entries of the CBS.log file after verification is completed.

 

Entry

Example

Explanation

Cannot repair member file file details

Cannot repair member file [l:14{7}]"url.dll" of Microsoft-Windows-IE-WinsockAutodialStub, Version = 6.0.5752.0, pA = PROCESSOR_ARCHITECTURE_INTEL (0), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeN

This entry indicates that the file content does not match the operating system definition for the file. In this situation, the SFC.exe program cannot repair the file.

Repaired file file details by copying from backup

Repaired file \SystemRoot\WinSxS\Manifests\\[ml:24{12},l:18{9}]"netnb.inf" by copying from backup

This entry indicates that a problem exists with a file. The SFC.exe program can repair this file by copying a version from a private system store backup.

Repairing corrupted file [ml:520{260},l:36{18}]"\??\C:\Windows\inf"\[l:18{9}]"netnb.inf" from store

Repairing corrupted file [ml:520{260},l:36{18}]"\??\C:\Windows\inf"\[l:18{9}]"netnb.inf" from store

This entry indicates that a problem exists with a file. The SFC.exe program can repair this file by copying a version from the system store.