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After installing windows 10 on a HP HP 255 G2 laptop there are 3 missing drivers. These are PCI device, unknown device, unknown device. The correct drivers are realtek PCIe card reader, HP wireless button, AMDA54 device. All can be updates by installing windows 10 updates. Instructions below. For windows 8 there are 4 missing drivers. These are PCI device, unknown device, unknown device, network controller. The correct drivers are realtek PCIe card reader, HP wireless button, AMDA54 device, wireless 1 and wireless 2. Click each to download.