Look up your product and see if they have factory resets noted in the documentation. If that fails, arrange for repair.
my tablet was showing error" unfortunately Gallery has been stopped" ....many times also in vlc. but I did ignor it. when I used "restart" it is showing only "dell logo" and the screen is blinking. I tried many times to restart it again but...I failed please suggest me .
I also tried to install a new os but how is it possible ? it is not showing anything except blinking screen light.