This is a known microsoft bug found on Windows 7 and its being also report in Windows Server 2008. There will be a fix from microsoft around this when they release Service Pack 2. If you encounter the following issue the only workable solution is to put all Hyper-V images to save state and then run the Windows Backup.
It seem that although there are some workaround solutions, none of them is really working.
Some solutions that might work for you before attempting the save state are the following:
1) Disable any Forefront or Trendmicro Antivirus solutions
2) Backup the following registry key:
HKLM\Software\Microsoft\EventSystem and then delete:
and restart the server. This will cause the VSS Entries to rebuild when the writer initializes
(Note: Do not delete the EventClasses Key)
3) Create a batch file with the following code to re-register the DLL’s and restart the VSS service:
cd /d %windir%\system32
Net stop vss
Net stop swprv
regsvr32 /i swprv.dll
regsvr32 /i eventcls.dll
4) Make sure your Windows Server is fully updated with all the latest patches.
5) Make sure that all your drivers and firmware are up to date.
6) Make sure you have at least 15GB of space available
If you have already done the following and your backup still fails your only way that will cause some downtime is to save the state of Hyper-V VHD Images and run the backup or wait until Microsoft releases SP2 for Windows Server 2008.
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