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After installing windows 8 on a LENOVO G580 laptop there are 3 missing drivers. These are BCM20702A0, PCI simple communications controller, Unknown device.
The correct drivers are Broadcom bluetooth 4.0 usb, Intel management engine interface, Lenovo ACPI compliant virtual power controller. All can be updated in device manager or update windows 8 operating system. Instructions under help area. Sometimes wifi is faulty try a usb wifi stick.
Don`t forget the correct power supply is 20v 3.25a 5.5mm 2.5mm



HELP Area...
Update drivers in device manager on windows 7.
Update drivers in device manager on windows 8 and 8.1.
Update windows 8 updates program.
Update drivers in device manager on windows 10.
Update windows 10 operating system.
Downloading and opening drivers in ZIP files.
Updating drivers by hand using ZIP files and device manager.
Opening and extracting HP drivers.
What to do if you have no wifi or lan..
Fixing mouse not working.
Using CMD to update drivers.
Recognizing common driver types
Resetting a windows 8, 8.1, 10 and 11 tablet or laptop
Website links


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