I was  recently performing driver reinstallation on a DC7700 HP Small form factor , when I came across a pci simple communications controller. This usually means a Modem , however there wasn’t one installed on this device. After a lookup of the Device ID ( 8086 – Intel) and Hardware ID’s ( 2994 ) on PCI Database it showed be the device was a “intel management engine interface”. There was no intel management engine interface on the HP DC7700 page , so I went to intels site to download one. However this did not work. Under more research it was the  Intel Host Embedded Controller Interface (HECI) Driver available here