unexpected shut down event id 1076

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  In our envirnment we are using windows server 2008 r2 Standard editon

  evey wednsday my exchange server goes restarted with bellow

  Log Name:      System
  Source:        USER32
  Date:          6/20/2012 5:57:05 PM
  Event ID:      1076
  Task Category: None
  Level:         Warning
  Keywords:      Classic
  User:          APPSERVER\administrator
  Computer:      SJKMAILSERVER.APPServer.local
  Description:
  The reason supplied by user APPSERVER\administrator for the last unexpected shutdown of this computer is: Other (Unplanned)
   Reason Code: 0xa000000
   Problem ID:
   Bugcheck String:
   Comment: 

  Event Xml:
  <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    <System>
      <Provider Name="USER32" />
      <EventID Qualifiers="32768">1076</EventID>
      <Level>3</Level>
      <Task>0</Task>
      <Keywords>0x80000000000000</Keywords>
      <TimeCreated SystemTime="2012-06-20T12:27:05.000000000Z" />
      <EventRecordID>39145</EventRecordID>
      <Channel>System</Channel>
      <Computer>SJKMAILSERVER.APPServer.local</Computer>
      <Security UserID="S-1-5-21-2940717196-699196800-862096716-500" />
    </System>
    <EventData>
      <Data>Other (Unplanned)</Data>
      <Data>0xa000000</Data>
      <Data>
      </Data>
      <Data>
      </Data>
      <Data>
      </Data>
      <Data>APPSERVER\administrator</Data>
      <Binary>0000000A000000000000000000000000000000000000000000000000000000000000000000000000</Binary>
    </EventData>
  </Event>

  Please give me solution for this

  Regards

  Chandrakant redkar

  9833816042

  Wednesday, June 20, 2012 12:46 PM