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After installing windows 8 and 10 on a HP PAVILION 15-N267SA laptop there are 4 missing drivers. These are PCI device, Unknown device and Unknown device. The correct drivers are Realtek PCIE card reader, HP wireless button driver and HP mobile data protection sensor. All these can be updated in device manager, instructions below. For windows 8 there is also a missing PCI simple communications controller, the correct driver is Intel engine management interface. click here to download.
Don`t forget the correct power supply is 19.5V 2.31A blue tip