There's a USB connection problem.
This may mean that you have too many USB accessories attached to your Xbox 360 console, or that one of your USB devices isn't working properly.
Turn off the Xbox 360 console.
Unplug the Kinect sensor and any USB accessories from your console.
One by one, plug each USB accessory back into the console to see if one of the accessories causes the problem. If you continue to see the USB error message, you might need to reduce the number of accessories attached to the console.
One by one, plug each USB accessory back into the console to see if one of the accessories causes the error.
Make sure the Kinect USB connector is plugged into the back of the console.
Would you like to contact Support regarding the "Error code C0051011 occurs when using an Xbox 360 Kinect Sensor" issue you were reading about or a different issue?