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I'm really stuck with this and I can't understand why I sunddendly can't make ANY VM to start succesfully in my system.

I had just one VM, and it was working perfectly, then for some reasons I booted into another system, then came back into WinServer 2012 and couldn't make them start anymore.

This is the traceback:

PS C:\Users\Administrator> Start-VM Ubuntu
Start-VM : 'Ubuntu' could not initialize. (Virtual machine ID 1ECB1603-A320-4BAF-8452-9962768F5D49)
You do not have permission to perform the operation. Contact your administrator if you believe you should have
permission to perform this operation.
At line:1 char:1
+ Start-VM Ubuntu
+ ~~~~~~~~~~~~~~~
+ CategoryInfo          : PermissionDenied:  (Microsoft.HyperV.PowerShell.VMTask:VMTask) [Start-VM], Virtualization
OperationFailedException
+ FullyQualifiedErrorId :  AccessDenied,Microsoft.HyperV.PowerShell.Commands.StartVMCommand

Seems clearly to be a permission issue of course, but I just don't get it, how?

I deleted my previous VM, not before I had it exported, THEN created a new VM, with new ID, using the same disk, same error above.

I even created a new one, without any disk, same error.

Does anyone know what could have happened?

Is there some script or configuration I should look for?

I've searched and searched even on msdn but nothing, I dont get it...

Any help would be greatly appreciated

Many Thanks in Advance!

EDIT

And, if I start it from HyperV's graphic interface, then it shows An error occurred while attempting to start the selected virtual machine(s) 'Ubuntu' could not initialize (Virtual machine ID 'ID')

SECOND EDIT

Following User @Peter Hahndorf suggestion, I ran icacls.exe and this is the output:

PS C:\Users\Public\Documents> icacls .\Hyper-V
.\Hyper-V BUILTIN\Administrators:(F)
  BUILTIN\Administrators:(OI)(CI)(IO)(F)
  BUILTIN\Hyper-V Administrators:(F)
  BUILTIN\Hyper-V Administrators:(OI)(CI)(IO)(F)
  NT AUTHORITY\SYSTEM:(F)
  NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(F)
  BUILTIN\Administrators:(F)
  CREATOR OWNER:(OI)(CI)(IO)(F)
  NT VIRTUAL MACHINE\Virtual Machines:(R,WD,AD)
  NT VIRTUAL MACHINE\Virtual Machines:(CI)(IO)(GR,WD,AD)

Successfully processed 1 files; Failed processing 0 files

It surely is about permissions, but how? I didn't "touch" anything, the folder is now placed under C:\Users\Public\Documents instead of C:\Users\Administrator\My Documents

How can I grant Administrator permission again?

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8
  • 1
    I take it you have a domain controller and AD installed to another system that this system authenticates to? OR is this stand alone without domain controllers and active directory...
    – Citizen
    Commented May 28, 2016 at 21:30
  • 1
    Could the "other system" have disabled the ability to run virtual machines in the BIOS/UEFI?
    – Andrew Morton
    Commented May 28, 2016 at 21:44
  • @Citizen No, this is standalone :(
    – NeoVe
    Commented May 28, 2016 at 23:00
  • @AndrewMorton Well, actually, I just installed Windows 7 Home edition on another partition, could it be that? :/ sounds weird to me... One never knows tho
    – NeoVe
    Commented May 28, 2016 at 23:01
  • @NeoVe It seems a bit unlikely that installing Windows 7 would change the BIOS/UEFI settings to allow running VMs, however, you should check the relevant settings. If you happen to have updated the BIOS then they are likely to have been reset.
    – Andrew Morton
    Commented May 29, 2016 at 16:39

0

Reset to default

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