On 2012-08-27 at 15:26 I said:

> that worked beautifully

Spoke too soon!
  True, it did work, but after I had left the PC with the guest (WinXP) 
running, when I returned 20 mins later the PC had powered off, and after 
re-booting V'Box reverted to its "VT-x is not available" failure (see 
below).

I've tried all the tricks I can think of:

  - Deleted the VM and re-imported it
  - Deleted the .VirtualBox directory so that V'Box re-created it, and   
then re-imported the Appliance.
  - Same again but *not* ticking the "Reinitialize the MAC address of 
all network drives" option during Import.

All to no avail.

I checked the American Megatrends Aptio BIOS: No sign of an  
'virtualization' options, though there is a 'Hyperthreading' option 
(enabled).

The error report in full is:

"Failed to open a session for the virtual machine Windows....

   VT-x is not available.  (VERR_VMX_NO_VMX)

    Result code:  NS_ERROR_FAILURE  (0x80004005)
    Component:  Console
    Interface:      IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb}"

Any advice/suggestion will be welome...

Many thanks,
-- 
/\/\aurice  (Retired on Surrey, UK)

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