Moodle 2 statistics not appearing in piwik



I have just installed piwik using the installation package from the apps, and it is running on my Windows 2012 and IIS server.

I have cut and pasted the tracking code and placed this in my additional HTML header section on my 2.6 Moodle, however I am not seeing any statistics appearing for my Moodle site.

Could anyone please help me, just in case I am missing something,

Thank you