Virtual Machines Fail to Start, cannot add disks

 After Windows Updates 12th Feb 2009 machines would not start.

kb958687
kb961260
kb948881
kb960715

"Failed to power on with  Error 'General Access Denied Error'"

If you detach the DISK, you cannot re-attach it

"failed to add device 'Microsoft Virtual Hard Disk'"

Event Log entries
Source Hyper-V-Worker Event ID 12220
Source Hyper-V-Worker Event ID 12290
Source Hyper-V-VMMS   Event ID 14140
Source Hyper-V-VMMS   Event ID 12140
Source Hyper-V-VMMS   Event ID 12620
Source Hyper-V-VMMS   Event ID 12290


You are in Deep schtuck.

The solution with some fiddling is as follows
regedit
navigate to 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97D-E325-11CE-BFC1-08002BE10318}\Properties

export it

Rightclick Properties, permissions, click through to change permissions you cannot see, click advanced, owner tab and take ownership, ok back to properties, and then click to add a permission, and all will come back.


Ok Click out and back to properties, 
export it again to another file
in that folder find "Security"

Delete the value

reboot server, re-attach any disks, and hey presto it works.

Many thanks to Microsoft Sydney for their help

This error is associated with Intel Server Managment software as well, I have seen it arounf a bit on S3200SHV and S3000AH boards

Jim Ladd ARRGHH me hearties

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Jimbo

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Jimbo