Dell Inspiron 1440 Windows XP Driver

Chipset
Download

Intel Matrix Storage Manager
Download

VGA Driver
Download

Audio Driver
Download

Conexant D400 External USB Driver
Download

Dell Multi-Device WiFi Driver
Download

Dell Wireless WLAN 1397 Half MiniCard (4312bg) \
 Download

Realtek LAN RTL8102EL Driver
Download

SATA Driver for Windows XP installation purpose, refer here:
http://getlaptopdriver.blogspot.com/2009/10/slipstreaming-guide-to-install-windows.html

For ATI graphics, ATI mobolity radeon HD 6450 and 6470,  12.3 ati catalyst driver (you can google it) is preferable, but going with the latest catalyst normally better.

You can download directly from ati here:
sites.amd.com/US/GAME/DOWNLOADS/Pages/radeon_xp-32.aspx

# Intel Core 2 Duo Processor T6500 2.1GHz
# Intel 4 series chipset
# 3GB DDR2 800MHz RAM
# 320GB Hard Disk Drive
# Internal 10/100/1000 Fast Ethernet
# Dell Wireless 365 Bluetooth Module
# Dell Wireless 802.11b/g WiFi
# Integrated 0.3 mega pixel web cam
# 8X max DVD+/-RW Drive with DVD+R double layer write capability
# ATI mobility Radeon HD4330 512MB Dedicated Graphics
# 14.1-inch WXGA 1366×768 LED Display
# 3 USB 2.0 Ports
# Memory card reader
# Windows Vista Home premium
# 6 cell battery