In order to solve this problem, try checking if the client automatically launches when the Windows starts. To do this, swipe from the right side of the screen, type msconfig and press Enter. Go to the Service tab, check the Hide all Microsoft service option from the bottom of the page, go to Startup and search for the application's process. Make sure that this is unchecked. Click OK, reboot your computer and try starting the game client again. Your should be able to start it.
If the problem isn't fixed, try running the program in compatibility mode with Windows XP. To do this, right click on its icon from desktop > Properties > Compatibility tab and check Run this program in compatibility with Windows XP.