okay this situation goes like this, i was downloading videos from tube mate in my internal memory, as soon as internal memory goes full. Android default notification came up saying storage is not enough type thing. I just ignored it because generally when internal memory is full tubemate will stop the downloading. But as soon as the memory gets full my phone slow down, i get it is due to low internal memory, but My went off and started with some thing missing the android stack and home screen button are of no use now, my drag down notification bar is blank and not dragging down things. I came to find out that in Setting->Home-> SeetingsExtRet is selected as launcher, when i tried to change it is changes in just option, my default launcher is Go launcher which is currently running fine, but in settings it is showing some SettingsExtRet is set a default. only my back key is working due to i have close all the way back to exit from an application or to go to another app as android stack is not working. Please anyone know what is this SettingsExtRet and how to remove it. Thanks In advance.