Where is the reset button on the dsc w55

I believe that this camera does not have reset button. You can reset the Camera by either using the Initialize option from the Menu or removing the battery. The Initialize option is under the Setup Menu of the Camera. To reset the Camera, remove the battery, press and hold the power button for more than 15 seconds and then reinsert the battery. Hope this helps, good luck.

Well, Ithink there is a reset button. You can find it opening the battery & card lid. There is a tiny hole, you should press it about 3 seconds.

go to any photo => click on "menu" button => setup=> internal memory tool => format=> OK :) that's all.