How to completely remove MYSQL?

Today, there is a friend's server to redo MYSQL, the installation to the last step is an old mistake, that is, the service is not closed, tried a variety of methods, finally found 诀窍:

1, first in Uninstall MYSQL in the control panel.

2, then delete the entire mysql folder in the installation directory

3, delete the configuration inside the registry: open "start"-->"Run"-->" Regedit "----> This will enter the registry in the registry and open the editor to enter the "mysql", (note that the 'value' and 'data' are removed from the view, this is to reduce the search unnecessary The value), find the items about MYSQL to delete them, to delete the item of an item, so that it can be installed.