How can I completely remove MySQL on Windows 7?
When I reinstall it, it is asking for the old password, so the uninstall is not complete, there is some remaining data.
Try using RevoUninstaller and begin the MySQL uninstall. It'll run the packaged uninstaller for the Windows version of MySQL and also search for leftover registry entries and files/folders. The link above should automatically start the free-version (which we use here at work and found it to be very helpful). Their main site is: RevoUninstaller