Could not install mysql, on windows, had several conflicts or bugs.
In order to solve it:
* Used the "libmysql.dll" provided by PHP zip files, not the one that comes with Mysql, the mysql file had to be moved or deleted from its folder. Put it on the "apache/bin" folder, altought some use it in "windows" folder.
* Originally, moved "*mysql*.dll" files from its extension folder, and returned back.
* enabled mysql driver extensions in the "php.ini" file, but also enabled some extensions, that seemed not to be required, but, it did, like "php_openssl.dll" or "php_pdo.dll" on an early version of php.
Added the "PHPIniDir xxx"" to the "httpd.conf" apache config. file, where xxx is the path to the folder where the "php.ini" file is located, and make sure its the same.
Be warned, that this fixes, may help or not, for your installation, since there are many ways to configure the same thing (to solve a problem).