Vista - event log error

i am getting the following error in my event log -
Log Name: System
Source: Microsoft-Windows-Kernel-WHEA
Date: 11/2/2007 2:39:14 PM
Event ID: 10
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: HarryClark-PC
Description:
Machine Check Event reported is a fatal Bus or Interconnect error.
Memory Hierarchy Level: 0
Participation: 0
Request Type: 2
Memory/IO: 0
Address: 151522877086159634
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Kernel-WHEA" Guid="{7b563579-53c8-44e7-8236-0f87b9fe6594}" />
<EventID>10</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2007-11-02T18:39:14.687Z" />
<EventRecordID>11157</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="64" />
<Channel>System</Channel>
<Computer>HarryClark-PC</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="TransactionType">0</Data>
<Data Name="Participation">0</Data>
<Data Name="RequestType">2</Data>
<Data Name="MemorIO">0</Data>
<Data Name="MemHierarchyLvl">0</Data>
<Data Name="Address">151522877086159634</Data>
<Data Name="Length">744</Data>
<Data Name="RawData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ata>
</EventData>
</Event>
i clicked to see if there is anything online and nothing was found. it is happening numerous times the whole time the computer is on but i am not noticing anything wierd happening in windows. anybody know what is causing this error?