PHP Error: Specified Module Could Not Be Found

I have just recently installed Apache, PHP, and MySQL manually. Everything seemed to be working. The only issue I had noticed was an error message would appear when Apache started, saying:

[COLOR=DarkOrange]Warning:
PHP Startup: Unable to load dynamic library ‘C:\PHP\php_mysql.dll’ - The specified module could not be found.[/COLOR]

So I checked to see if the file was missing from the specified location, and it was. It is located in the ‘ext’ folder. So I made a copy and placed it in the location where it said it couldn’t find it.

I then restarted Apache and it gave the same message even though the file is located at ‘C:\PHP\php_mysql.dll’

What am I doing wrong here?