Look for any item with a yellow exclamation mark (e.g., "Unknown Device" or "Copressor").
If you have installed all drivers but still see an "Unknown Device" in Device Manager with the hardware ID PCI\VEN_8086&DEV_2A99 : Pegatron Corporation 2a99 Motherboard Drivers
This is likely the driver.
Install the Intel GMA driver (or your dedicated NVIDIA/AMD driver if you have a separate graphics card). Look for any item with a yellow exclamation mark (e