ดาวน์โหลดไดร์เวอร์ Dell optiplex 775 
Download Driver Dell optiplex 775 For Windows 10 32 & 64bit, Windows 8.1 32 & 64bit, Windows 7 32 & 64bit, Windows Vista 32 & 64bit, Windows XP 

1.Graphics Drivers        
Intel(R) Q35 Express Chipset Family    (Download) 

2.Network & Wireless Drivers
Intel(R) 82566DM-2 Gigabit Network Connection   (Download) 

3.System & Chipset Drivers
Intel(R) ICH9 Family 2 port Serial ATA Storage Controller 2 - 2926
Intel(R) ICH9 Family PCI Express Root Port 1 - 2940
Intel(R) ICH9 Family USB Universal Host Controller - 2934
Intel(R) ICH9 Family USB Universal Host Controller - 2935
Intel(R) ICH9 Family USB Universal Host Controller - 2936
Intel(R) ICH9 Family USB Universal Host Controller - 2937
Intel(R) ICH9 Family USB Universal Host Controller - 2938
Intel(R) ICH9 Family USB2 Enhanced Host Controller - 293A
Intel(R) ICH9 Family USB2 Enhanced Host Controller - 293C
Intel(R) ICH9DO LPC Interface Controller - 2914
Intel(R) ICH9R/DO/DH 4 port Serial ATA Storage Controller 1 - 2920
Intel(R) Q35 Express Chipset PCI Express Root Port - 29B1
Intel(R) Q35 Express Chipset Processor to I/O Controller - 29B0 (Download) 

4.SM-Bus-Controller
Intel(R) ICH9 Family SMBus Controller - 2930 (Download) 

5.Hard Disk Controller Drivers
Intel(R) ICH9R/DO/DH 6 Port SATA AHCI Controller - 2922 (Download)