Usually, its your chipset driver. The most recent driver for this model are Windows 7 only. So, you will have to try those to see if they work: Make sure the most important are installed: Chipset, Display driver and Network (Ethernet and Wireless). Also, install any storage drivers. To find other drivers that might be missing. Press Windows key + X Click Device Manager Right click in entries you see with an exclamation sign Click Properties Go to the Details tab Click in the Property list box Choose Hardware ids Choose the shortest value in the value list box Right click it then click Copy Open your web browser and go to your favorite search engine then paste it in then perform a search.
It should provide a description and like resource link where you can download the driver. Best, Andre Windows Insider MVP MVP-Windows and Devices for IT twitter/adacosta groovypost.com.
This page contains the driver installation download for PCI Serial Port in supported models (HP EliteBook 8440p (VV954AV)) that are running a supported operating system.