windows server 2008 r2 crashes /reboots radomly giving kernel power error

Log Name:      System
Source:        Microsoft-Windows-Kernel-Power
Date:          8/26/2013 8:16:05 PM
Event ID:      41
Task Category: (63)
Level:         Critical
Keywords:      (2)
User:          SYSTEM
Computer:      dell-t110.Nexgen.com
Description:
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />
    <EventID>41</EventID>
    <Version>2</Version>
    <Level>1</Level>
    <Task>63</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000002</Keywords>
    <TimeCreated SystemTime="2013-08-26T14:46:05.124069600Z" />
    <EventRecordID>25644</EventRecordID>
    <Correlation />
    <Execution ProcessID="4" ThreadID="8" />
    <Channel>System</Channel>
    <Computer>dell-t110.Nexgen.com</Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="BugcheckCode">122</Data>
    <Data Name="BugcheckParameter1">0xfffff6fc40018ef8</Data>
    <Data Name="BugcheckParameter2">0xffffffffc0000185</Data>
    <Data Name="BugcheckParameter3">0x182e01be0</Data>
    <Data Name="BugcheckParameter4">0xfffff880031df000</Data>
    <Data Name="SleepInProgress">false</Data>
    <Data Name="PowerButtonTimestamp">0</Data>
  </EventData>
</Event>