Getting Kernel Power error ID 41

Hello, Can anyone help me with a constant random Pc reboot error. My event log says it's a kernel Power error ID 41. I really don't know what is wrong with it. Should i re format my pc? I have vital information on my pc for my examinations and i don't want to lose all of them. Plz help me with that issue.
Here is the event log info and i've attacted the minidump file( i don't know how to read it myself). Any help would be appreciated. also if any info lacks in the post that can help you solve my problem..tell me.

Log Name: System
Source: Microsoft-Windows-Kernel-Power
Date: 31/08/2011 15:57:50
Event ID: 41
Task Category: (63)
Level: Critical
Keywords: (2)
User: SYSTEM
Computer: Home-PC
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="2011-08-31T11:57:50.453125000Z" />
<EventRecordID>83036</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>System</Channel>
<Computer>Home-PC</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="BugcheckCode">80</Data>
<Data Name="BugcheckParameter1">0xffffb8a00d74e9d0</Data>
<Data Name="BugcheckParameter2">0x0</Data>
<Data Name="BugcheckParameter3">0xfffff88006364954</Data>
<Data Name="BugcheckParameter4">0x7</Data>
<Data Name="SleepInProgress">false</Data>
<Data Name="PowerButtonTimestamp">0</Data>
</EventData>
</Event>