From Microsoft Database:
To reinstall or repair Internet Explorer and Outlook Express, use either of the following methods while you are logged on as an administrator.
Method 1: Reinstall or Repair Windows XP
To repair or reinstall Internet Explorer and Outlook Express in Windows XP, complete the following procedure while you are logged on as an administrator:
Use the System File Checker tool to scan all of the protected files on your computer:
Click Start, and then click Run.
In the Open box, type sfc /scannow, and then click OK.
Note that you may be prompted for the Windows XP or Windows XP Service Pack 1 installation media.
Test to determine if the issue is resolved. If the issue is resolved, skip the remaining steps. If the issue is not resolved, continue to the next step.
Complete an in-place upgrade of Windows XP, a repair of Windows XP, or reinstall Windows XP. For additional information about how to complete an in-place upgrade or repair of Windows XP, click the article number below to view the article in the Microsoft Knowledge Base:
315341 How to Perform an In-Place Upgrade (Reinstallation) of Windows XP
To reinstall Windows XP updates, visit the following Microsoft Windows Update Web site:
http://windowsupdate.microsoft.com/
Method 2: Edit the Registry and Install Internet Explorer 6
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
When you try to reinstall the same version of Internet Explorer, you may receive the following error message:
Setup has detected a newer version of Internet Explorer already installed on this system.
Setup cannot continue.
To avoid this error message and reinstall the same version of Internet Explorer and Outlook Express, follow these steps:
While you are logged on as an administrator, click Start, and then click Run.
In the Open box, type regedit, and then click OK.
Locate the appropriate registry subkey, right-click the IsInstalled (REG_DWORD) value, and then click Modify.
To reinstall only the Internet Explorer 6 browser component on Windows XP, use the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{89820200-ECBD-11cf-8B85-00AA005B4383}
To reinstall only Outlook Express 6 on Windows XP, use the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}
Change the value data from 1 to 0, and then click OK.
Quit Registry Editor, and then install Internet Explorer 6.
To reinstall Windows XP updates, visit the following Microsoft Windows Update Web site:
http://windowsupdate.microsoft.com/
By default, Internet Explorer 6 is preinstalled in all versions of Windows XP and cannot be removed. To provide computer manufacturers more flexibility in configuring desktop versions of Windows XP, Microsoft has made it possible for OEMs, administrators, and users to remove user access to Internet Explorer while leaving the Internet Explorer code intact and fully functional to make sure the functionality of programs and operating system functions that rely on it. For example, Windows XP supports an "IEAccess=off" switch in the Unattend.txt file, and Internet Explorer has been added to the Add/Remove Windows Components section of the Add/Remove Programs tool in Control Panel. This does not reinstall Internet Explorer.
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