MySQL 5.0 Reference Manual :: 2 Installing and Upgrading MySQL :: 2.3 Installing MySQL Enterprise :: 2.3.5 Uninstalling MySQL Enterprise :: 2.3.5.1 Uninstalling on Windows
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To uninstall MySQL Enterprise on Windows you should use the Add or Remove Programs utility located within the Control Panel.
Packages within MySQL Enterprise must be removed individually. You may also use this option to remove packages that you no longer want or use.
Any data you created while MySQL Enterprise was installed will not be removed. You will need to separately delete this information.
User Comments
Just to add, when you uninstall Mysql, the Mysql directory stays in your drive and you should either remove it manually (databases, if any, will be lost) or rename it (being a paranoid) so that when you install again, its actually a fresh install. This solves the forgot-password problems as well.
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