Uninstallation problem

When I’m trying to uninstall CPF latest version on Win XP Pro, I receive at first a message about files to be removed manually, and then a warning for an error about files shared in msconfig, and the uninstallation freezes in the “removig firewall configuration” screen. After reboot, the comodo folder is still there but cpf.exe cannot be found. How can I uninstall correctly?