When you try to uninstall IE 5.x or greater, you receive:
Microsoft Internet Explorer <version> Setup was not completed successfully.
If the version of the Advpack.dll library on your computer is earlier than 5.00.2014.200, the uninstall will fail.
To resolve the issue:
1. Use Windows Explorer to navigate to %SystemRoot%\Windows Update Setup Files and doulbe-click the ie6setup.exe or ie5setup.exe file.
2. When the End-User License Agreement (EULA) screen is displayed, press Cancel.
3. Press Yes to abort the setup.