I had this problem when I installed xdebug under Apache and PHP.
In php.ini, find the line that looks like this:
zend_extension_ts="c:/PHP/ext/php_xdebug-2.1.2-5.2-vc6.dll"
and comment on it.
If you need to use xdebug, make sure you download the correct version of xdebug for your php installation. I had Apache 2.2.17 with PHP 5.2.17, and I tried to install xdebug for PHP 5.3, which gave me this error message:
* The entry point of the zend_ini_string_ex procedure cannot be located in the php5.dll dynamic link library *
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