Do you have a Windows XP CD? If so try running your System File Checker.
sfc
from help in XP
===========================================
Description of Windows XP and Windows Server 2003 System File Checker
(Sfc.exe)
Applies To
This article was previously published under Q310747
For a Microsoft Windows 2000 version of this article, see 222471 .
SUMMARY
This article describes System File Checker (Sfc.exe), which is a
command-line utility used with the Windows File Protection (WFP) feature.
MORE INFORMATION
System File Checker gives an administrator the ability to scan all protected
files to verify their versions. If System File Checker discovers that a
protected file has been overwritten, it retrieves the correct version of the
file from the cache folder (%Systemroot%\System32\Dllcache) or the Windows
installation source files, and then replaces the incorrect file. System File
Checker also checks and repopulates the cache folder. You must be logged on
as an administrator or as a member of the Administrators group to run System
File Checker. If the cache folder becomes damaged or unusable, you can use
the sfc /scannow, the sfc /scanonce, or the sfc /scanboot commands to repair
its contents.
System File Checker Tool Syntax
Sfc [/Scannow] [/Scanonce] [/Scanboot] [/Revert] [/Purgecache]
[/Cachesize=x]
a.. /Scannow: Scans all protected system files immediately and replaces
incorrect versions with correct Microsoft versions. This command may require
access to the Windows installation source files.
b.. /Scanonce: Scans all protected system files one time when you restart
your computer. This command may require access to the Windows installation
source files when you restart the computer. The SfcScan DWORD value is set
to 2 in the following registry key when you run this command:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
c.. /Scanboot: Scans all protected system files every time you start your
computer. This command may require access to the Windows installation source
files every time you start your computer. The SfcScan DWORD value is set to
1 in the following registry key when you run this command:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
d.. /Revert: Returns scan to the default setting (do not scan protected
files when you start the computer).The default cache size is not reset when
you run this command. This command is equivalent to the /Enable switch in
Windows 2000.
e.. /Purgecache: Purges the file cache and scans all protected system
files immediately. This command may require access to the Windows
installation source files.
f.. /Cachesize=x: Sets the file cache size to x megabytes (MB). The
default size of the cache is 50 MB. This command requires you to restart the
computer, and then run the /purgecache command to adjust the size of the
on-disk cache. This command sets the SfcQuota DWORD value to x in the
following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
For additional information about the Windows File Protection feature, click
the article number below to view the article in the Microsoft Knowledge
Base:
222193 Description of the Windows 2000 Windows File Protection Feature
The information in this article applies to:
a.. Microsoft Windows Server 2003, 64-Bit Datacenter Edition
b.. Microsoft Windows Server 2003, 64-Bit Enterprise Edition
c.. Microsoft Windows Server 2003, Datacenter Edition
d.. Microsoft Windows Server 2003, Enterprise Edition
e.. Microsoft Windows Server 2003, Standard Edition
f.. Microsoft Windows Server 2003, Web Edition
g.. Microsoft Windows XP Home Edition
h.. Microsoft Windows XP Professional
i.. Microsoft Windows XP 64-Bit Edition
j.. Microsoft Windows XP Media Center Edition
k.. Microsoft Windows XP Tablet PC Edition
Last Reviewed: 6/4/2003 (4.0)
Keywords: kbinfo KB310747
