Hi ,
If the system has worked properly before, then the problem can occur if
some of the system files are corrupted. To resolve the issue try restoring
the system to an previous date or run sfc/scnnow in the command prompt.
This you can do by following the steps given below:
1)Running the System Restore in Windows xp:
http://www.microsoft.com/windowsxp/pro/using/itpro/managing/restore.asp
2)Running the SFC(System File Checker utility):
http://support.microsoft.com/default.aspx?scid=kb;EN-US;310747
or
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]
/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.
/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
/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
/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.
/Purgecache: Purges the file cache and scans all protected system files
immediately. This command may require access to the Windows installation
source files.
/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
S.Vijay
This posting is provided "AS IS" with no warranties, and confers no rights
