problem loading mysql dlls

I am trying to upgrade an Apache 2 PHP installation on XP Home from an earlier version of PHP 5 to version 5.2.4. The previous version was working fine. Now I am getting the following message when starting Apache: [18-Sep-2007 18:11:52] PHP Warning: PHP Startup: Unable to load dynamic library 'c:\php\php524\ext\php_mysql.dll' - The specified procedure could not be found. in Unknown on line 0 phpinfo.php runs fine and returns the following Configuration File (php.ini) Path C:\WINDOWS Loaded Configuration File C:\php\php524\php.ini extension_dir c:\php\php524\ext c:\php\php524\ext ENVIRONMENT Path C:\php\php524\ext;C:\rails-prod-win\ruby\bin;c:\ruby\bin;c:\program files\imagemagick62;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\ATI Technologies\ATI Control Panel;C:\Program Files\QuickTime\QTSystem\; I looks to me like all of the paths for finding the dlls match. The php_gd2.dll is uncommented in php.ini, but it does not produce and error message and gd is enabled in the phpinfo.php output. I have reloaded the php directory from the zip file, but this does not help. What should I try next? Thanks, Bob Newsome