If you never use the dial-up modem and simply want a clean Device Manager:
Without these drivers, software that communicates via COM1 or specific PCI add-in cards will fail to initialize. Step 1: Identify Your Hardware Configuration dell optiplex 755 pci serial port driver windows xp
The OptiPlex 755 uses the Intel Q35 Express chipset. The "PCI Serial Port" in question is almost always one of two things: If you never use the dial-up modem and
This guide provides the exact steps and resources needed to resolve "Yellow Bang" errors in your Device Manager and get your COM ports back online. Why Your Serial Port Isn't Working Why Your Serial Port Isn't Working Dell released
Dell released a specific driver package for the OptiPlex 755 modem under Windows XP.
The PCI serial port driver for the Dell Optiplex 755 under Windows XP was typically provided by Dell as part of the system's driver package. The driver was designed to work with the system's integrated serial port, which was usually based on a standard 16C550 or compatible UART (Universal Asynchronous Receiver-Transmitter) chip.