You need to change the registry key before re-installing. In
particular:
To avoid this error message and reinstall the same version of Internet
Explorer and Outlook Express, follow these steps: 1. While you are
logged on as an administrator, click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. 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}
4. Change the value data from 1 to 0, and then click OK.
5. Quit Registry Editor, and then install Internet Explorer 6.
6. To reinstall Windows XP updates, visit the following Microsoft
Windows Update Web site:
http://windowsupdate.microsoft.com/
(
http://windowsupdate.microsoft.com/)
The above steps worked for me on SP1 version.
hth
