Probably because it operable with macos mojave. Dell optiplex 990 installation of windows xp pro sp2 stevewa device manager showed a problem with no driver for pci serial port and no driver for pci. Insert the expansion card in the connector on the system board and press down until secured. Allowing higher-level computer companies in device manager shows as possible.

Before you close the device manager window, ensure that you note down the model and make of your dell device. I have a dell optiplex 780 and i am using windows 10 build 14955, every time i troubleshooting, configure a device it tells i need to download the driver for this. It's 100% safe, uploaded from safe source and passed avg virus scan! Be respectful, keep it civil and stay on topic. Pull the release lever away from the pci x16 card until you release the securing tab from the dent in the card. I have tried disabling, uninstalling, refreshing, rebooting. Download Now DELL 780 PCI SERIAL PORT DRIVER