After the last anniversary update of windows 10 (of august 2) hyper-v fail to start any of the virtual machine, new or old.

The message I get is "Virtual Machine Name" failed to start worker process: An invalid HANDLE was specified. (0xC0000008).

Error dialog

I have try many thinks, and look all over the internet bug I can not find solution.

  1. I have totally remove and re-install the hyper-v
  2. I have check for correct permissions on the directories of the vm
  3. I have run Process Monitor to see why is crash
  4. I have read the debug report that send to MS
  5. I have made from scratch new test virtual machines, for both generations.

after all that is still not runs...

Any idea is appreciate.


I have the exact same issue and also found no solution jet.

I've also installed the latest BIOS - no success.

My specs are: - Win 10 Pro (Build 1607) - MainBoard: ASUS X99 Deluxe - CPU: i7-5820K

I'll check my drivers now and then I'll give the SFC a try...


Updated / Re-Installed some drivers now - no success

SFC running..


SFC had no success eighter.


I found that COMODO Internet Security is the problem at hand. Uninstalling it & rebooting fixed the issue. But with no virus protection left, this isn't a good solution.

At the COMODO Forum there is a thread for this issue, too. We should wait what COMODO finds out: https://forums.comodo.com/bug-reports-cis/comodo-firewall-began-conflict-with-hyperv-t116351.0.html

  • I have made the same with no success either – Aristos Aug 15 '16 at 13:13
  • Can't believe that we're the only two having this issue. It's sad that there is still no solution for this. I don't want to re-setup the whole host mashine -.-... – Khaos Aug 31 '16 at 8:42
  • I can not agree more with you. And even if you re-setup the system I am not believe that the issue will go. – Aristos Aug 31 '16 at 9:38
  • Ok. I found some posting saying, that Comodo Anti-Virus can be the problem. I'll check this myself now. Do you use Comodo, too? – Khaos Sep 1 '16 at 15:33
  • 1
    Uninstalling COMODO & restarting the computer fixed the problem! – Khaos Sep 1 '16 at 15:45

I had exactly the same issue with a test virtual environment in Hyper-V which was working perfectly on my Windows 10 machine.

I installed Intel Unite Software on my PC and could no longer start any Hyper-V VM. I then uninstalled this software it began working immediately. I would recommend uninstalling any non-vital programs you've installed recently, prior to when Hyper-V stopped functioning.

I am looking into this software to see what component caused this and will update if I gent anything more useful. Hope this helps.


Today Comodo Firewall update their drivers inspect.sys and was signed by Microsoft, and hyper-v starts working again with out the above message.

The working Comodo Firewall version on files is


I had the same issue, uninstalling mirrorop virtual driver resolved this issue. I think every virtual driver can result in this kind of issue.

  • what is that driver ? where and how you uninstall it ?, please give some more informations - this error by the way was a problem coming from comodo firewall and now have been fixed. – Aristos Mar 14 '17 at 6:41

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