Please bear in mind your processor has the first generation Intel® HD graphics. The graphics drivers available for your graphics controller are for Microsoft® Windows XP, Vista, 7, 8 and Linux (limited)
According to your computer manufacturer, Microsoft® Windows Server 2012r2 is not supported.
HP EliteBook 8440p Notebook PC – Overview
HP Support document - HP Support Center
You need to work with the inbox drivers provided with Microsoft® Windows Server 2012 package