Dell Optiplex 755 Pci Serial - Port Driver Windows Xp

Target OS: Windows XP (32-bit or 64-bit) Hardware: Dell OptiPlex 755 (Mini-Tower, Desktop, Small Form Factor, or Ultra Small Form Factor) The Problem After a fresh installation of Windows XP on a Dell OptiPlex 755, you open Device Manager and see a yellow exclamation mark next to "PCI Serial Port" (or "Unknown Device"). This is not a COM port for a mouse or modem. Instead, it is the PCI Soft Data Fax Modem (Conexant D850) or an optional serial port add-on card.