The iGPU options are in the "System Agent" section. There will be several things you can change, but what you need to be concerned with is "Initiate Graphic Adapter" (Set to PCIe/PCI) and "iGPU Multi-Monitor" (Set to Enabled). That works for me to be able to install the Intel drivers and Virtu on my P8Z68-V LE with a 2500K, so I would think it should work with a P8Z68-V Pro too.
tried the above on my P8Z68-V LE and it still came up with the same error: "No Intel(R) HD SandyBridge Graphics Family device was found. Check your BIOS and verify that your integrated graphics is enabled. Virtu Setup will now exit."
I rechecked and it is in enable position. Is the PCIe/PCI selection correct ? There is a PCI/PCIe option as well.
Or does this only work if you have 2 monitors or something ?
yep, enabled everything as per the instructions from DJDecibel. Updated the BIOS and tried again with all settings as per instructions and still get the error. I only have one monitor but I wouldn't have thought that makes any difference.