sometimes when restart windows, my installed programs and settings are removed.why?

  mmm.shz 07:36 30 Apr 14
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Hi Shortly before, when i turn on my computer, all installed programs and settings are removed from windows. then i restart the computer and so programs and settings are regained. this event occurred 2-3 times. Lately, for solving this problem, i remove all partitions and create new partitions, and setup new windows on computer. but again this problem is occurred. but the installed programs do not regain yet. can you help me to fix this problem...??

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