VM crash on server reboot (update)

hi, 
have problem vm. when hyper-v server has been restarted after update located on virtual machine did not rise. message: 

<event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <system>
    <provider name="microsoft-windows-hyper-v-worker" guid="{51ddfa29-d5c8-4803-be4b-2ecb715570fe}" />
    <eventid>18590</eventid>
    <version>0</version>
    <level>1</level>
    <task>0</task>
    <opcode>0</opcode>
    <keywords>0x8000000000000000</keywords>
    <timecreated systemtime="2014-03-24t13:54:47.645925800z" />
    <eventrecordid>478</eventrecordid>
    <correlation />
    <execution processid="988" threadid="1524" />
    <channel>microsoft-windows-hyper-v-worker-admin</channel>
    <computer>xxxxxxxxx</computer>
    <security userid="s-1-5-83-1-3618063166-1224939579-508470409-687079697" />
  </system>
  <userdata>
    <vmleventlog xmlns:auto-ns2="http://schemas.microsoft.com/win/2004/08/events" xmlns="http://www.microsoft.com/windows/virtualization/events">
      <vmname>xxxxxxxxxxxxxx</vmname>
      <vmid>d7a7433e-183b-4903-89a4-4e1e1101f428</vmid>
      <vmerrorcode0>0x50</vmerrorcode0>
      <vmerrorcode1>0xa2b2560</vmerrorcode1>
      <vmerrorcode2>0x1</vmerrorcode2>
      <vmerrorcode3>0x224982c</vmerrorcode3>
      <vmerrorcode4>0x2</vmerrorcode4>
    </vmleventlog>
  </userdata>
</event>

what happened? what's problem?

hi,

please go through following link, might helpful needs.

http://social.technet.microsoft.com/forums/windowsserver/en-us/38f7bf66-0a39-4905-90f8-c6900a4fdfd6/hyperv-guest-vms-disappeared-after-orderly-reboot-not-virus-scanning-issue?forum=winserverhyperv

regards,

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