Hyper-V Virtual Machine missing, unable to recreate

I am running a Windows 2008 server with Hyper-V.  I have two VM's running on this server.  The first is a Windows 2008 Std SQL/File/Print server and the second is a Windows 2003 w/Exchange 2003.  This morning when I came into work the Exchange server was down.  After checking the Hyper-V Manager I noticed that the entire VM was missing.  The SQL VM is functioning properly.  I have failed over to our backup exchange server however I need to get my primary one back online.  

I have tried recreating the VM and then connecting it to the existing VHD's however when I try to start I receive an error indicating that the VM failed to start with a failure powering on the Microsoft Synthetic Ethernet Port (See Screen Shot).  I have tried creating a VM from scratch using new VHD's instead of connecting to the existing ones and receive the same error meaning I can't even fully rebuild the server if required.  I have also attempting some basic things like restarting the host as well as the VMMS service.  Nothing fixes the problem.  When I check the event log I have the following 4 errors in a row each time I attempt to start the newVM:

Event ID 4096

The Virtual Machines configuration 62074FB0-CB70-4050-B778-C297371B6E05 at 'E:\Virtual Machine' is no longer accessible: The requested operation cannot be performed on a file with a user-mapped section open. (0x800704C8)

Event ID 12010

'Exchange' Microsoft Synthetic Ethernet Port (Instance ID {47D6ECBC-EE1B-4D80-BBF6-670433366E5D}): Failed to power on with Error 'The specified network resource or device is no longer available.' (0x80070037). (Virtual machine 62074FB0-CB70-4050-B778-C297371B6E05)

Event 18160

The description for Event ID 18160 from source Microsoft-Windows-Hyper-V-VMMS cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event:

Exchange
62074FB0-CB70-4050-B778-C297371B6E05
%%3222072877
0xC00CEE2D

The resource loader failed to find MUI file

Event ID 12030

'Exchange' failed to start. (Virtual machine 62074FB0-CB70-4050-B778-C297371B6E05)



At this point in time the VM I just created becomes non functional and I have to remove it along with the GUID in the C:\ProgramData\Microsoft\Windows\Hyper-V\Virtual Machines locations.

The only thing on the host server that has changed was that through WSUS the Cumulative Security Update for Internet Explorer 8 For Windows Server 2008 x64 Edition (KB980182) was installed last night.

I appreciate any assistance getting back up again.  

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jer007Manager of Planning & I.T.Asked:
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jer007Manager of Planning & I.T.Author Commented:
My TrendMicro AV went into an offline state which caused it to ignore some exceptions related to the VM.  This caused it to block access to the virtual NIC.  After disabling the AV on the host everything worked fine.  I'm up and running again!

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