interesting information found here :
> http://blog.avivasolutions.nl/archive/2 ... aptop.aspx
How to enable VT-x on HP 8510p laptop
Until the introduction of VirtualBox 3.0 (which includes SMP support) I never really cared for enabling hardware assisted virtualization, since it actually slowed down my VMs. But since the new VirtualBox version requires this in order to use more than one processor, I needed to enable this in my BIOS. However, after enabling the setting within the BIOS, and restarting my laptop, the VT-x option was still disabled within VirtualBox.
After several reboots and reinstalls of VirtualBox, I stumbled across a post (can’t remember the link unfortunately), where the suggestion was made that – after you have enabled the hardware assisted VT option in the BIOS – you remove the battery for at at least 30 seconds.
After that, reboot and voila! VT-x is enabled inside VirtualBox.
Posted on 02-07-2009 by Arnold Jan van der Burg
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10-08-2009 by Toetke
Thanks! Had the same problem, this solved it.