Hyper-V - 'Failed to start the virtual machine 'test' because one of the Hyper-V components is not running.'

Hi all,
Having a bit of a nightmare with Hyper-V on my Windows 8 Pro laptop - Whenever I create a new VM and try to start it I receive the following error;
'Failed to start the virtual machine 'test' because one of the Hyper-V components is not running.'
I sometimes also receive an error saying something along the lines of 'Unable to change virtual machine state'
I have done a lot of searching a seen two common answers - The first is to try removing the Hyper-V role and re-adding it - I have tried this several times to no avail. (Intel VT and all virtualisation capabilities are enabled in BIOS). The second issue
it would seem
some people have had relates to editing the VMX configuration file and adding the line
hypervisor.cpuid.v0 = "FALSE" - I thought VMX files were only present in VMware Virtual Machines...
Any help would be greatly appreciated.
Many thanks in advance.
James

The hypervisor event log message is generated only at boot - so this would be expected.  Also vmbus should not be running on the host (I was looking at a VM yesterday)...  This error message is generated only when the vid is determined not to be
running or cannot communicate with the hypervisor.
I have seen this due to anti-virus software in the past or due to driver verifier being configured.  Since it looks like you checked driver verifier already do you have anti-virus software installed?  If so have you followed the best practices
and exempted the Hyper-v services? 
http://technet.microsoft.com/en-us/library/dd283088(WS.10).aspx
To resolve this problem, configure the real-time scanning component within your antivirus software to exclude the following directories and files:
Default virtual machine configuration directory (C:\ProgramData\Microsoft\Windows\Hyper-V)
Custom virtual machine configuration directories
Default virtual hard disk drive directory (C:\Users\Public\Documents\Hyper-V\Virtual Hard Disks)
Custom virtual hard disk drive directories
Custom replication data directories, if you are using Hyper-V Replica
Snapshot directories
Vmms.exe (Note: This file may have to be configured as a process exclusion within the antivirus software.)
Vmwp.exe (Note: This file may have to be configured as a process exclusion within the antivirus software.)
-Taylor Brown<br/> -Program Manager, Hyper-V<br/> -http://blogs.msdn.com/taylorb

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