Dell Inspiron 14 3421 drivers for (windows 7)

Realtek ALC3221 Audio Driver. This package provides High-Defination Drivers Works Fine with both windows7 and 8.
Download : Realtek ALC3221 Audio Driver

Intel Chipset Driver 

Intel HM77 Express Chipset Family Driver.Suported on both Operating System Windows8  and Win7 .
Download :Intel HM77 Express Chipset

Synaptics Touchpad Driver(Dell touchpad)

Dell Touchpad Driver Input .Works with both  Win8 And 7
Download: Synaptics Touchpad Driver(Dell touchpad)

Realtek Ethernet Controller Driver

Realtek RTL8105E-VD Ethernet Controller . Win7 and Win8
Download: Realtek Ethernet Controller Driver 

Intel Management Engine Interface Driver

Intel Management Engine Interface Driver Only for win 7.(chipset Driver)

Download: Intel Management Engine Interface Driver

Intel USB 3.0 eXtensible Host Controller Driver

Intel USB 3.0 eXtensible is a 3.0 Host Controller Driver for win 7. 
Download: Intel USB 3.0 

Dell Wi-Fi + BT Driver

Dell Wireless 1704 802 and  1703 11b/g/n  For windows7. 

Download: Dell Wi-Fi + BT Driver 1704 
                    Dell Wi-Fi + BT Driver 1703

nVIDIA Graphics Driver

nVIDIA Geforce GT625M / GT640M / GT730M Graphic. 
Download: nVIDIA Graphics Driver


Realtek Card Reader Driver

Realtek Card Reader Driver for win 7 and windows 8 .
Download: Realtek Card Reader Driver