They were the OEM drivers that came with the system. I didn't have a chance to check the dates because we were under time pressure to get the system's into the customer's hands ASAP.
FYI - they were both HP Pavilion G6-2239DX systems.
We had an HP Desktop (Win8) alongside it that didn't have any problems.
I'm trying to get the boss to OK another system for testing, but we're now having update problems with Lenovo systems also.