Hp Compaq Dc7900 Free Download For Windows 7

1.Driver - Audio

SRS Premium Sound Driver 
ADI High-Definition (HD) 

2.Driver - Chipset
Download

3.Driver - Graphics

ATI Graphics Driver for Integrated and Non-HDMI Graphics Solutions
NVIDIA 32-Bit Graphics Driver
Intel Graphics Driver
 

4.Driver - Network
Broadcom NetXtreme Gigabit Ethernet 
Ralink 802.11n Wireless LAN 
Intel PRO/1000 Drivers