win 8 apps terminate after a while

Hi there,
I'm using windows 8, I was able to use all apps and enjoying them
but unfortunately now, they will not open
I click on the app's tile in start menu, it tries to open but after seeing the loading, suddenly it terminates and start menu comes up.
I googled and found solutions like resolution changing, uninstalling programs and changing user acount settings and it won't work for me
what should I do :(