I’d all but given up getting this little HP Laptop going again. I’d tried every System Interrupts cure there was online, but just found HP had just droppped (March 9th, 2018) a new BIOS file on their driver download page. Updated, all working. This £180 14-ac100na is never going to win any speed race, but for updating websites, and basic browsing and watching a film it’s great.
Driver for this machine are here … make sure you change the operating system if your not using Win 10 64-bit. https://support.hp.com/us-en/hp-14-ac100/