Why is xdebug not showing up in phpinfo()

I am trying to get the following to setup work:

• Windows 7 - 64-bit
• XAMPP 1.7.4
• XDebug [php_xdebug-2.1.0-5.3-vc9-x86_64.dll]

When I run phpinfo() from Xampps homepage, XDebug it is not listed anywhere. I checked the Apache error logs and there are no errors, so it seems to load the module without problem? I haven't used PHP in years so I have no clue why this isn't working.

[PHP.ini]

[XDebug]
zend_extension_ts = "C:\xampp\php\ext\php_xdebug-2.1.0-5.3-vc9-x86_64.dll"
xdebug.remote_enable = 1
xdebug.remote_handler = "dbgp"
xdebug.remote_host = "localhost"
xdebug.remote_port = 9000