mysql completely uninstall and reinstall

Completely uninstall mysql: http://jingyan.baidu.com/article/f96699bbaa8fc1894f3c1b5a.html (graphic)

                           http://blog.csdn.net/ludwig_/article/details/52634587 (more thorough)

Anthropomorphic mysql: http://blog.csdn.net/ni_hao_ya/article/details/9235251

                    (When the configuration process encounters port 3306 being occupied, Ctrl+Alt+Del closes the mysqld.exe process)