I downloaded php_xdebug-2.0.5-5.3-vc9.dll, added at the end of PHP.ini the following line:
zend_extension_ts=\"C:/Program Files/php5/ext/php_xdebug-2.0.5-5
perform php --ini to check witch config file is loaded. if you have something like this : Loaded Configuration File: (none) Scan for additional .ini files in: (none) Additional .ini files parsed: (none) Just copy your php.ini in windows directory ;)