Source : HP Support
Download Compaq 320 Notebook Drivers Windows XP/Vista/7
Chipset
Intel Chipset Installation Utility
Version 9.1.1.1025, 2MB
Windows XP/Vista/7 (32/64-bit) : Download
  
Storage 
Intel Matrix Storage Manager Driver (MSM)
(Provide update Serial ATA (SATA) and AHCI.) 
Version 8.6.9.1002, 18MB
Windows XP/Vista/7 (32/64-bit) : Download
*You can choose either to use Intel Matrix Storage Manager (MSM) or  Intel Rapid Storage Technology Driver (RST) for your Storage driver.  (recommended : RST) -see note 1
Storage
Intel Rapid Storage Technology (RST)  
Version 9.6.0.1014, 6MB
Windows XP/Vista/7 (32/64-bit) : Download
Audio Patch
For Microsoft Windows XP Operating Systems, the Microsoft Universal  Audio Architecture (UAA) Driver must be installed before installing the  audio driver. Reboot after installation.
Download (From HP Server)  
Download (From Microsoft)
Audio
IDT High Definition Audio Driver
Version (5.10.6268.0 and 6.10.6268.0) , 27MB
Windows XP/Vista/7 (32/64-bit) : Download
Graphic
ATI/AMD HD 54xx and 53xv series 
Version 8.743.2.5-110315A-115833C  
Windows XP, 136MB : Download
Windows Vista/7 32-bit, 128MB : Download
Windows Vista/7 64-bit : Download
Graphic
Intel Graphic Driver and control Panel
Version 8.15.10.2057 
Windows XP, 17MB : Download
Windows Vista/7 32-bit, 128MB : Download
Windows Vista/7 (32/64-bit) : 129MB: Download
Hotkey
HP Hotkey Support for keyboard with HP Quicklaunch button.
Requirements: Please Install .NetFramework 3.5 SP1 or above first. 
Version 4.0.3.1, 17MB
Windows XP/Vista/7 (32/64-bit) : Download
Touchpad
Version 15.0.4, 29MB
Windows XP/Vista/7 (32/64-bit) : Download
Webcam/Camera
HP Universal Webcam Driver
Version 2.00, 45MB
Windows XP/Vista/7 (32/64-bit) : Download
Modem
LSI High Definition Audio Modem
Version 2.2.98.0, 5.9MB
Windows XP/Vista/7 (32/64-bit): Download 
LAN - Ethernet
Realtek PCIe GBE and FE Family Controller 
Version 1.00, 5.4MB
Windows XP/Vista/7 (32/64-bit) : Download
HP Webcam Software 
Please install webcam driver above first before installing this application.Windows XP/Vista/7 (32/64-bit) : Download 
HP battery Check : 
Useful and free utility which let you monitor your battery status. 
Windows XP 32/64-bit : Download 
Windows 7/Vitsa 32/64-bit , 9MB : Download 
