For HP ProBook 4420s Notebook users with a windows XP platform  , here it is a complete download links for its drivers.Do email me or stick into comment area if any broken link appears while downloading through these links.
HP ProBook 4420s Sound Audio Driver
IDT High-Definition Audio Driver

HP ProBook 4420s Chipset Driver
Intel Chipset Installation Utility

Intel Management Engine Components Driver

HP ProBook 4420s Graphics Video VGA Display Driver (ATI)
ATI Video Driver and Control Panel

HP ProBook 4420s Graphics Video VGA Driver (Intel)
Intel Video Driver and Control Panel

ArcSoft Webcam Sharing Manager

HP ProBook 4420s Webcam Camera Driver
HP Universal Camera Driver

HP ProBook 4420s Touchpad Driver
Synaptics TouchPad Driver

HP ProBook 4420s Fingerprint Driver
Validity Fingerprint Sensor Driver

HP ProBook 4420s Modem Driver
LSI High-Definition Audio (HDA) Modem Driver for Microsoft Windows

HP ProBook 4420s Ethernet LAN Network Driver
Realtek Ethernet Controller Drivers

HP ProBook 4420s Bluetooth Driver
Software Support for HP Integrated Module with Bluetooth Wireless Technology

HP ProBook 4420s Wireless LAN WLAN WiFi Driver (Broadcom)
Broadcom Wireless LAN Driver

HP ProBook 4420s Wireless LAN Driver (Realtek)
Realtek RTL8191SE 802.11b/g/n Wireless LAN Driver for Microsoft Windows

HP ProBook 4420s Mobile Broadband Driver
Qualcomm Mobile Broadband Drivers - Gobi2000

HP ProBook 4420s Wireless LAN Driver (Atheros)
Atheros Wireless LAN Driver for Microsoft Windows XP

HP ProBook 4420s Wireless LAN Driver (Intel)
Intel PRO/Wireless Drivers

HP ProBook 4420s Card Reader Driver
Realtek Media Card Reader Driver

HP ProBook 4420s SATA AHCI Driver
Intel Matrix Storage Manager

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