If all else fails you can try a hard reset which will wipe all your data and start you from new. This is done by pressing the start button and the up volume button at the same time . Hold them both down till the machine starts . you will see probably the android and then a selection menu . Use your volume to scroll up and down the menu . Select factory reset and then yes wipe data and it will reformat the tablet and it will start from new. Hope this helps.