The support of "Intel Virtualization Technology" (Intel VT) depends on the CPU you installed on the MB. If the processor comes with this feature, you can see the item "Intel VT" displaying under "Advanced Setup" of G43T-M's BIOS as the screenshot below. On the contracy, if your CPU does not support it, that item won't appear in CMOS Setup of this MB.

You can access the following Intel website to confirm whether your processor equips with "Intel Virtualization Technology".

http://processorfinder.intel.com/

When you insert an external graphics card like Nvidia 9500GT to motherboard, the onboard graphics will be automatically disabled and the external graphics will be as the first priority output. So the onboard VGA driver can’t be installed to system.