i was using bluestacks from a long time but a few days before when my windows 10 updated, bluestacks stopped working. i saw an article on bluestacks website about BlueStacks compatibility issues after Windows 10 update. actually windows new feature hyper-v was preventing bluestacks from running. if we disable the hyper-v from control panel > programs > turn windows features on or off, it should work now but in my case hyper-v was already unchecked. One more thing that i noticed is when i install a fresh bluestacks (or any emulator) it works fine but as soon as i restart my pc it stops working again.