How can I uninstall MySQL (Server + Workbench)?

To remove MySQL Workbench and Server from
your Windows computer, you need to go through the following 4 steps (with no
exception). Make sure you complete all of them to finish the operation
successfully:

1. Uninstall MySQL from Control Panel/Programs
   and Features

2. Uninstall MySQL from the start
   menu/Firewall/Allow an App through Windows Firewall (if found there)

3. Remove all files from drive
   C:/ProgramData/MySQL (if this folder is hidden on your computer, you could
   search for %programdata% in the start menu)

4. Remove all files from the Windows
   registry. To complete this step, you need to search for regedit in the start
   menu. Then, remove all files from the MySQL folder in the regedit editor.

You must complete all steps from 1) to 4) before
you can restart your computer and retry installing the MySQL

Workbench and Server again.