Vista - Hardware-assisted Virtualization "not available"

All,

last week I received my brand new PC (Dell OptiPlex 755 with E8400 Intel
Core 2 Duo), and I'm not able to get Hardware-assisted Virtualization running
on Virtual PC 2007 SP1.
My host system is a Vista Business x64 with 4 GB RAM, and all Virtualization
options are enabled in the BIOS. I even did a BIOS Firmware update to the
latest - no change. I read, that sometimes you need to do a cold boot in
order to make Virtualization changes in the BIOS work -> no change.

Am I missing something? What else could be the reason for VPC not to allow
me doing hardware virtualization? I found a tool on the internet
http://www.grc.com/securable.htm that I ran on my PC, and the result was "64,
Yes, Yes" which means that my 64-bit OS is able to do hardware virtualization.

Thanks for your help guys!

Thomas

On Fri, 13 Jun 2008 06:27:00 -0700, Ultimus
<Ultimus@xxxxxx> wrote:
Unfortunately, one BIOS update might not be enough. On my Toshiba
M400, it took Toshiba 4 or 5 BIOS updates to get HW virtualization to
work without crashing the host PC.
Try contacting Dell support and see if this is a known issue.

--
Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/
I do not work for Microsoft.