1. Normally the drivers need to be install is: Graphic (SMSBUS), Card Reader, Infrared, Quicklaunch, Modem and Touchpad.
2. Other Driver like sound, if you heard sound, no need to install audio. Similar to wireless and other, if they work no need to install.
3. make sure to check windows updates, there are 2 sections which is critical updateand optional updates, select optional updates and there you will see several updates for your driver especially graphics.
CHIPSET DRIVERS:
INF Update Utility - Primarily for Intel® 5, 4, 3, 900 Series Chipsets
Download (Intel website)
Intel Chipset Installation Utility:
Download
GRAPHIC
Compaq Presario CQ40-504AU Graphic Driver
ATI Mobility Radeon HD 3200/3450/4200/4330 Graphics
Download
AUDIO:
Compaq Presario CQ40-504AU Audio Driver
IDT High-Definition Audio CODEC Driver
Download
Compaq Presario CQ40-504AU Button Driver
HP Quicklaunch Button
Download (direct)
Download (HP)
Compaq Presario CQ40-504AU Touchpad Driver
ALPS Touchpad Driver
Download
HP Wireless Assistant
Download (direct)
Download (HP)
Compaq Presario CQ40-504AU LAN/Ethernet Driver
Realtek PCI-E Gigabit Ethernet NIC Driver
Download
WIRELESS:
Compaq Presario CQ40-504AU Wireless Driver
Broadcom Wireless LAN Driver for Microsoft Windows 7
Download
CARD READER:
Compaq Presario CQ40-504AU CArd Reader Driver
JMB38X MS SD SD/MMC xD Card Reader Driver
Download
Validity Sensor Driver For Windows 7
Download
WEBCAM:
Compaq Presario CQ40-504AU Webcam Driver.
Cyberlink YouCam Software
Download
Lightscribe System Software
Download
INFRARED:
Compaq Presario CQ40-504AU Infrared Driver
ENE CIR Receiver Driver
Download
HP USB Recovery flash Disk
Download
HP Recovery manager for Windows 7
Download
HP Mediasmart DVD software
Download