You cannot reinstall mysql.

Problem: It is reinstalled after uninstallation. It will not work after re-installed N times. I still cannot delete the items in the registry. Solution: I have met your experience, and I have solved it myself. You can solve it by following the methods below.
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Uninstall existing mysql and customize the installation during installation. When selecting the installation path, select and view the installation path of [MySQL Server Datafiles] and delete the files in that path on the hard disk, for example, after the installation is complete, you will enter the new password and confirm the password. Startup is complete. For other installations, the settings remain unchanged. Make sure that you can run it correctly.

You detach the mysql software installed in windows and reinstall it. In Figure 1, select m for installation (Custom), and then click Next, in Figure 2, click MySQL Server Datafiles, find the default installation path, and delete the files in that path on the hard disk. For other installations, the settings remain unchanged. Make sure that you can run it correctly.

Because the mysql you previously uninstalled does not uninstall the configuration, that is, the installation path of [MySQL Server Datafiles] Still Exists. When you install it again, the installer checks the previous installation information, if yes, it will not be overwritten. Www.2cto.com