Ok, here is my suggestion for drivers, test it and report which works and which not, the main problems is with the audio which is Conexant High-Definition Audio Driver, anyway hope this drivers works and report the progress.
Some drivers will automatically install
note that for every installation i recommend to right click and select run as administrator
Intel Chipset Installation Utility for ICH9m for Microsoft Windows 7
Intel Matrix Storage Manager
Conexant CX20549-12 High Definition Audio Driver
If this driver didn't work, we need to do manual installation, leave your comments so i can guide you through the manual installation.
Conexant HDAUDIO Soft Data Fax Modem with SmartCP Driver
Mobile Intel 965 Express Chipset Family Video/Graphics Driver
ALPS Touchpad Driver
Cyberlink YouCam Software
Lightscribe System Software
HP Wireless Assistant
If you have Intel Wireless:
Intel Wireless LAN Driver for Microsoft Windows 7
If you have Broadcom Wireless:
Broadcom Wireless LAN Driver for Microsoft Windows 7
If you have Atheros Wireless
Atheros Wireless LAN Driver for Microsoft Windows 7
Software Support for HP Integrated Module with Bluetooth Wireless Technology
Realtek RTL8139/810x Family Fast Ethernet NIC
Why there are no official driver release for windows 7 for this model?
It is become the HP/Compaq way to tell user what OS you should use with the model you have, so if there are only driver officially for Xp release mean your laptop only can be use with windows XP. However the not directly prohibit you to use other OS, but you will need to contatct them for technical issues such as compatible driver and other setting.
How do I get this driver?
Normally i use to test it on one of the model similar to this model, example this model is C738TU, so i just need to find another laptop with similar specs say C740TU, compare them, do some research and came out with suggestion.