increasing max upload size on server 2008 R2

Our  network manager has installed Moodle in our school  on server 2008 R2 IIS - but the vanilla install has a max upload size of 2MB.

He says he has followed the instructions here  http://docs.moodle.org/24/en/File_upload_size

trying both with instructions for  the server 2008 and the XP/Server 2003 but no joy.

Does anyone have any suggestions please?

thanks