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After installing windows 10 on a LENOVO GAMING Z40-70 laptop there are 6 missing drivers. These are USB2.0-CRW device, Unknown device, SM bus controller device, PCI simple communications controller device, 3D video controller device. The correct drivers are Realtek USB 2.0 card reader, Lenovo ACPI-compliant virtual power controller, Intel(r) 8 series SMbus controller - 9C22, Intel(r) management interface, Nvidia geforce 840m. All can be updated in device manager or update windows 10 operating system. The only you need drivers for is the graphics card, click here to download.
Don`t forget the correct power supply is 20V 3.25A USB tip