: Owners of older machines like the OptiPlex 320 can find the driver package through Dell's support archives . Manual Installation Steps

The hardware ID PCI\VEN_1002&DEV_4385 refers to the (System Management Bus). This component is critical for communication between the motherboard chipset and various hardware sensors, such as temperature monitors and fan controls. Where to Download the Driver

that can scan your system and provide the latest chipset drivers, which include the SMBus controller

If you have downloaded a .cab or .zip driver package, follow these steps to install it manually: