Mac Pro, Windows 7 Virtual PC-XP Mode Problem w/ Hardware Virtualization

I have installed windows 7 (64 bit) on an 8 month old intel mac pro with latest bootcamp. runs great. cannot get virtual pc / xp mode to work.
confirmed latest firmware, confirmed processor has virtualization (vmx listed in processor details when boot to snow leopard).
when i run ms hardware-assisted virtualization detection tool it confirms hardware virtualization. after i install xp mode and virtual pc update i get an error message that there is no virtualization. ms hardware-assisted virtualization detection tool will now also report no virtualization. if i uninstall xp mode and virtual pc update, ms hardware-assisted virtualization detection tool will again confirm virtualization.
any thoughts? i searched forum but did not see anything - sorry if i missed it.
thanks in advance for input...

Because the hardware of Mac Pro does have Intel-VT capability, it's just disabled.
One solution (though a very lame one) is boot into OS X first, run VMware Fusion or Parallel (which enables Intel-VT), then restart into Windows.
Just hope there would be some way to enable Intel-VT on Windows...

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