|If you're connected to your network wirelessly and trying to get into the router's management interface, you probably have the router set to not allow a wireless client to access the interface.|
Plug your PC in to the router (disable the wireless NIC while doing this) and then connect.
Report back here whether or not you're successful in getting into the management interface from the wired connection.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.