First, open the windows XP installation disk and click "Support Tools" to go to the hard disk's Support Tools installation directory (X: \ Program Files \ Support tools.exe, find msicuuu.exe, and double-click, the "windows Installer Clean Up" window is displayed, showing the list of all programs currently installed. Select a stubborn program from it, and click "Rmove" to uninstall the program. To Uninstall the Registry with msizap.exe, open the Registry Editor and choose Hkey_LOCAL_MACHINE \ Software \ Microsoft \ windows \ CurrentVersion \ Uninstall, find the identification of the stubborn Program (for example, {268723B7-A994-4286-9F85-B974D5CAFC7B}) in the left-side Navigation Pane, and then select the "Start> program> windows Support Tools> Command Prompt" Command. After the Command Prompt, run the following command: msizap T {identification of stubborn program}. Press enter to uninstall the stubborn program.