To perform a reset to the default factory setting make sure the camera is switched off. In off position press the power button for at least 4 seconds until the LEDs start blinking. Then release the Power button and wait for the sequence to finish.
The camera will boot, do the reset and then switch itself off.
Restart the camera by pressing the power button shortly. The factory default settings are now restored.
Click the following link to view a video on how to perform a factory reset: http://vimeo.com/31009984