Update for Windows 2008 x64 failed (KB950049). Hyper-V RC1

I am trying to install the KB950049 Update on one 2008 x64 server to update Hyper-V from RC0 to RC1 and the udpate fails for some reason.

This is the output, does anyone know why this might be?

Log Name:      System
Source:        Microsoft-Windows-WindowsUpdateClient
Date:          6/20/2008 11:55:32 AM
Event ID:      20
Task Category: Windows Update Agent
Level:         Error
Keywords:      Failure,Installation
User:          SYSTEM
Computer:      <computername>
Description:
Installation Failure: Windows failed to install the following update with error 0x80070020: Update for Windows (KB950049).
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-WindowsUpdateClient" Guid="{945a8954-c147-4acd-923f-40c45405a658}" />
    <EventID>20</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>1</Task>
    <Opcode>13</Opcode>
    <Keywords>0x8000000000000028</Keywords>
    <TimeCreated SystemTime="2008-06-20T15:55:32.658Z" />
    <EventRecordID>12194</EventRecordID>
    <Correlation />
    <Execution ProcessID="248" ThreadID="2800" />
    <Channel>System</Channel>
    <Computer>enterprise.pa.msu.edu.intranet</Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="errorCode">0x80070020</Data>
    <Data Name="updateTitle">Update for Windows (KB950049)</Data>
    <Data Name="updateGuid">{0CE04E24-1675-4E59-87DD-1E4424104DA9}</Data>
    <Data Name="updateRevisionNumber">501</Data>
  </EventData>
</Event>
wingnut691983Asked:
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wingnut691983Connect With a Mentor Author Commented:
I resolved this by making sure all of the virtual machines were stopped propr to installing the update, then it installed fine.
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