Upgrade to VB 4.3.4 will not Run

[meld51]

Hello,
I have just upgraded to VB 4.3.4 having received an update notification.

It was notable during the installation process that it did not do the usual thing about asking whether I wanted to install the various additions so the installation needed very little input from me. This is not usually the case.

I get the following error message:

Failed to open a session for the virtual machine
Virtual XP3
VT-x is disabled in the BIOS
(VERR_VMX_MSR_VMXON_DISABLED)

I have run VB for years without a problem so what's up I wonder? I have not altered the BIOS.

Log File is attached

VB Base Memory is 256MB
IDE Primary Master is 30 GB

The Host is Windows 8.1 64 bit
The Guest is XP
I have made no changes to the Host BIOS

Thanks in advance

[Perryg]

Upgrade to 4.3.6 and see if it works.
viewtopic.php?f=1&t=59176

[meld51]

Yes that worked.
Must have been a bug in 4.3.4
Phew!