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After installing windows 8 and 10 on a DELL LATITUDE E6400 PP27L laptop there are 3 missing drivers. These are Broadcom USH, Video controller and SD compliant SD host controller. The correct drivers are Dell control vault with fingerprint sensor, Intel GM45/GE45/GS45 and SD card. For dell control vault 32 bit click here. For dell control vault 64 bit click here. For the other 2 update the drivers in device manager. For windows 7 there are just the 2 dell control vault drivers. For vista there is Ethernet controller missing, network controller, SMBus controller and vga. Dell control vault is the same. The correct drivers are Intel 82567LM gigabit ethernet, Intel wifi link 5100 AGN, Intel chipset and Intel GM45, GE45, GS45. Click each one to download.

Don't forget the correct power supply for this laptop is 19.5v 3.34a/4.62a 7.4mm 5mm