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After installing windows 8 and 10 on a HP PRESARIO A900 laptop there are 2 missing drivers. These are Video controller and Unknown device. The correct drivers are Mobile intel (R) 965 express chipset family 32 bit, Mobile intel (R) 965 express chipset family 64 bit and Hp quick launch buttons. Click each to download. For windows 7 there are another 4 missing drivers. These are Ethernet controller, Unknown controller, Unknown controller, Unknown controller. The correct drivers are Modemn, USB, SD card and wifi. Click each to download.
Don`t forget the correct power supply is 18.5v 3.5a slim tip