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Recently i have want to add some downloaded microsoft apps like maps or onedrive and many app from the store. And when i try to open those apps i am not able to open them.nor any other microsoft corporation app. I have tried soft reset many times but it doesn't. Work . Give me any other solution...

i am using lumia 540 and sometimes screen remain black when i unlock my phone but the os is running as i can listen the lock and unlock sound tell me the reason and it heppen sometimes only . and the main thing is i am using my phone on windows 10 preview .