When you install security update
on Microsoft Windows XP, you receive the following error message after your
Explorer.EXE - Entry Point Not Found -
The procedure entry point SHCreateThreadRef could not be located in the dynamic
link library SHLWAPI.dll
This error occurs when MS04-038 is installed on a computer
with a failed Windows XP Service Pack 2 (SP2) installation. Typically, if
Windows XP SP2 installation fails, an automatic rollback occurs that returns
the computer to the pre-Windows XP SP2 installation state. If automatic
rollback does not occur, the service pack recovery process will partially
uninstall Windows XP SP2 after you restart your computer. (For example,
automatic rollback may not occur if a power failure occurs during Windows XP
SP2 installation.) After you restart the computer again, you receive a message
that prompts you to use Add or Remove Programs
Panel to manually remove the remnants of the failed installation.
you do not follow this recommendation, and you do not use Add or Remove
to remove the remnants of the failed installation, your
computer will have pre-Windows XP SP2 files, and your registry will contain
Windows XP SP2 information.
If your computer has pre-Windows XP SP2
files and your registry contains Windows XP SP2 information,
or Automatic Updates offers the Windows XP SP2 version of the
To recover your computer, follow these steps:
- Start your computer and log on as you typically do.
Note If your computer will not start correctly, start the computer in
For additional information, click the
following article number to view the article in the Microsoft Knowledge Base:
A description of the Safe Mode Boot options in Windows XP
- When you receive the error message, press CTRL+SHIFT+ESC to
open Task Manager. You can safely ignore any additional error
messages that may appear.
- On the File menu, click New Task
- In the Open box, type control
appwiz.cpl, and then click OK. You can safely
ignore any additional error messages that may appear.
Note If the Add or Remove Programs tool (Appwiz.cpl) does not open,
type the following line in the New Task (Run...) box to remove
the Internet Explorer fix, and then go to step 5:
- In the Add or Remove Programs window, click Windows
XP Hotfix – KB834707, click Remove, and then follow
- When the Finish button becomes available,
click Finish, and then let your computer to restart, even if
it seems that the removal process is not complete. You can safely ignore any
messages about additional software or hotfixes that are installed during this
Warning Although your computer may successfully start without error
messages, your computer is still in an incomplete Windows XP SP2 state. You
must complete the remaining steps and reinstall Windows XP SP2.
- After your computer restarts, click Start,
and then click Control Panel.
- Click Add or Remove Programs, click
Windows XP Service Pack 2, click Remove, and
then follow the instructions. If you receive a message about software that you
may have installed after you installed Windows XP SP2, make a note of the
titles. You may have to reinstall these products after you reinstall Windows XP
Note If you cannot access Add or Remove Programs, use Task Manager as
described in steps 1, 2, and 3. Remove Windows XP Service Pack 2 by typing the
following in the New Task (Run...) box:
- After your computer restarts, visit the
Web site. Reinstall Windows XP SP2.
about how to install Windows XP SP2, and for steps that you can take to help
make sure that Windows XP installs successfully, visit the following Microsoft
- After Windows XP SP2 has successfully installed, visit the
Web site and install any critical updates.
If this procedure does not work, you can perform an in-place
For additional information, click
the following article number to view the article in the Microsoft Knowledge
How to perform an in-place upgrade (reinstallation) of Windows XP
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
Q1: I do not think my computer is in an "incomplete Windows XP SP2 state." How can I know for sure?A1:
. After you successfully remove Windows XP Hotfix – KB834707, use
one of the following methods to determine whether your computer is in an
incomplete Windows XP SP2 state.
- Check Add or Remove Programs for the presence of Windows XP
SP2. If Windows XP SP2 is listed, go to step 2. If Windows XP Service Pack 2 is
not listed, Windows XP Service Pack 2 is not installed.
- Determine the version of the Lsass.exe file that is in the
%Windir%\System32 folder. To do this:
- Click Start, click
Search, and then click All Files and
- In the All or part of the file name
box, type %windir%\system32\lsass.exe, and then click
- Right-click the Lsass.exe file, click
Properties, and then click the Version tab.
Note The Lsass.exe file may appear as "Lsass" without an
If the version number of the Lsass.exe file is earlier than
5.1.2600.2096, and Windows Service Pack 2 appears in the Add or Remove Programs
tool, your computer is in an incomplete Windows XP SP2 state.
, and then click Run
, and then click
If the version is listed as "Version 5.1 (Build
2600.xpsp_sp2_rtm.040803-2158: Service Pack 2" or a later version, you have the
correct installation of Windows XP SP2. However, if the version has a number
that begins with a 01, a 02, or a 03, your computer is in an incomplete Windows
XP SP2 state. Additionally, if any number that is less than 040803 appears
after "xpsp2", such as "Build 2600.xpsp2.030422-1633: Service Pack 2," your
computer is in an incomplete Windows XP SP2 state.
information about Windows XP SP2, click the following article number to view
the article in the Microsoft Knowledge Base:
How to obtain the latest Windows XP service pack