why did my applications close unexpectedly?

[Android Question]

I am having a different problem, all the things i downloaded from my google play store automatically stopped opening and since then i have not been able to access my facebook, whatsapp,talking tom and my google play store stopped unexpectedly too. Please i need help.

 

[BAJ716]

Did you try rebooting? Hold the power button until the menu pops up, select "shutdown". Wait until the screen goes off, then another 10 seconds or so, then press and hold the power button until the screen comes back on.