How do I restiore my Start screen?

  srira25 15:11 20 Apr 2014
Locked

I have windows 8.1 on my PC.I ran a CCleaner registry cleaner yesterday.When I open the PC today, the desktop view works fine.But I am not able to access the tile view or access any of my apps.When I press the Start button,it displays the tiles ,but after 3 seconds , it hangs ,and if I again press the Start button,it again refreshes after so much stuttering and again hangs after 3 seconds.Not even able to access Settings or Charms.I even tried to use the backup of Ccleaner.But still,there is no change.What should I do now?Please explain the solution in a detailed step by step fashion ,as I am new to windows 8.1 and not know all its features.

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