Unable to Start any VM in one of the Hyper-V node(Windows Server 2012) cluster.


  • Issue started post upgradation of Symantec, Symantec upgradation is not successful
  • Unable to migrate any VM from another node in a cluster
  • Unable to start any VM in that node. After clicking start, VM is in Starting stage and throwing error after 2-5 minutes.

Error Messages Seen:
TEST failed to start worker process: “server execution failed (0x80080005)”

Troubleshooting done:

  • Given full control to Everyone on  below regkey: HKCR\AppID\{8BC3F05E-D86B-11D0-A075-00C04FB68820}
  • Post giving permission, able to start VM on the host.
  • Compared the registry key permissions with other working machine and found Creator Owner was missing on problem machine. I added it and removed the everyone. Able to start VM
  • To fix WMI and DCOM errors, I  re-registered the dlls  by running below command ( for /f %s in (‘dir /b *.dll’) do regsvr32 /s %s ) to resolve the issue.

Attached is the detailed document with all screenshots. Unable to Start VM -Doc