why can't install the xdebug?

my op system is XP. the PHP Version 5.3.6. the php path is D:/php

i downloaded the PHP 5.3 VC6 (32 bit) version from the http://www.xdebug.org/download.php

i added the following code to the php.ini:

[Xdebug]
zend_extension="D:/php/ext/php_xdebug.dll"
xdebug.collect_params=On
xdebug.collect_return=On
xdebug.trace_output_dir="d:\xdebug" 
xdebug.profiler_enable=On 
xdebug.profiler_output_dir="d:\xdebug"

then restarted the apache, using phpinfo(). it doesn't output the xdebug. wh开发者_StackOverflow社区at's wrong with my setting? thank you.

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Download http://xdebug.org/files/php_xdebug-2.1.2-5.3-vc6-nts.dll

rename it php_xdebug.dll

Put it in D:/php/ext/

Restart apache