It would also help if you specified WHICH version of WAMPServer 3 you are installing, and if you are installing it OVER an old version of WAMPServer or installing a vanilla WAMPServer.
If you install over a valid older version of WAMPServer, and you therefore already have a version of MySQL installed, did you change the password on the `root` user? If so then try using the old password.
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(Windows 10 Pro 64bit) (Wampserver 3.3.4 64bit) Aestan Tray Menu 3.2.5.4
<Apache versions MULTIPE> <PHP versions MULTIPLE> <MySQL Versions MULTIPLE>
<MariaDB versions MULTIPLE> <phpMyAdmin versions MULTIPLE> <MySQL Workbench 8.0.23>Read The Manuals Apache --
MySQL --
PHP --
phpMyAdminGet your Apache/MySQL/mariaDB/PHP ADDONs here from the
WAMPServer alternate Repo-X-X-X-
Backup your databases regularly Here is How dont regret it later! Yes even when developing -X-X-X-