PHP5 not loading mysql.dll and mysqli.dll

I've been trying to install mysql. I installed that new PHP5 that just came out with the zip file. I configured in php.ini where the .dll files are: c:/php/ext/. Then I uncommented php_mysql.dll and php_mysqli.dll. When I restarted apache 1.3.31, my server, it said that it could not find those files in c:/php/ext/. EX) PHP Startup: Unable to load dynamic library 'c:/php/ext/php_mysql.dll' - the specified module could not be found. Though the file is right there. So then I did research and found that those files needed libmysql.dll and libmysqli.dll to load. However, those files are already sitting nice and cozy in c:/php, and I copied them to c:/php/ext just in case. What's the problem?