The Windows ACPI driver, Acpi.sys, is an inbox component of the Windows operating system. As times changed and PC Pitstop grew, we transitioned to a software subscription model to not only provide better and more secure diagnostic and maintenance tests, but turn our focus.-> Using Microsoft’s Internet Explorer along with ActiveX technology, we could provide free diagnostic and maintenance tools that didn’t need to be installed. The default drivers Microsoft provides are stripped down and a bit older, but they’re written by your device manufacturer - not Microsoft themselves. Windows includes built-in drivers and automatically downloads new ones to make setup easier, but device manufacturers also provide their own driver packages. Download the latest drivers, firmware, and software for your HP Stream Notebook - 11-d010nr (ENERGY STAR).This is HP’s official website that will help automatically detect and download the correct drivers free of cost for your HP Computing and Printing products for Windows and Mac operating system.