If you meant you wanted a fictional or humorous short story about someone hunting for those drivers, let me know and I’ll write one. Otherwise, the above is the true “story” of why that search happens and how to solve it.

The Dell Optiplex 780 is an older model that still requires reliable drivers for its various components. One of the essential drivers for this system is the PCI serial port driver. The PCI serial port driver is necessary for communication between the system's serial ports and other devices.

On the same Dell support page, switch to , choose your OS, and download at least:

The OptiPlex 3040 is a relatively modern machine (released around 2015-2016). Windows 10 and Windows 11 usually find most drivers automatically, but if you see unknown devices in Device Manager, follow these steps.

At the same time, you also need drivers for a newer OptiPlex 3040 (circa 2015), possibly for chipset, audio, LAN, or storage controllers after a clean OS install.