Vista - WHEA errors posted - ideas please

I get the following error entries in the WHEA area of the logs.

Log Name: Microsoft-Windows-Kernel-WHEA
Source: Microsoft-Windows-Kernel-WHEA
Date: 28-Apr-08 13:29:41
Event ID: 5
Task Category: None
Level: Information
Keywords:
User: SYSTEM
Computer: nissen370-PC
Description:
WHEA successfully initialized.
4 error sources are active
Error record format version is 10.
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>5</EventID>
<Version>0</Version>
<Level>4</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x4000000000000000</Keywords>
<TimeCreated SystemTime="2008-04-28T17:29:41.473Z" />
<EventRecordID>19</EventRecordID>
<Correlation />
<Execution ProcessID="4" ThreadID="8" />
<Channel>Microsoft-Windows-Kernel-WHEA</Channel>
<Computer>nissen370-PC</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data Name="ErrorSourceCount">4</Data>
<Data Name="ErrorRecordFormat">10</Data>
<Data Name="ErrorSourceTableLength">4224</Data>
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0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000</Data>
</EventData>
</Event>

What causes this type of error. Any Ideas.
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