Graphics adapter shows Video Controller (VGA Compatible)

Hello,

I have an HP EliteDesk 800 G1 USDT with embedded Intel 4600 graphics controller. No matter what I do I cannot get the PC to show the Intel adapter in system properties, it stubbornly just displays the VGA Compatible object.  Which means poor video performance and cannot use an extended desktop across two screens.

I have downloaded the Intel driver from HP and also visited Intels site and autodetected and installed the correct drivers from there, but still the VGA Compatible object remains.

Any ideas?

Thanks very much.

Alasdair Barclay