If a "PCI Serial Port" driver is missing in Device Manager, you need the Chipset or Serial Port driver from your motherboard manufacturer . To narrow this down, please tell me:
Are you trying to connect an or a USB-to-serial adapter ? Driver Communication Port Com1
Click at the top menu and select Show hidden devices . If a "PCI Serial Port" driver is missing
In Device Manager, find your device under (e.g., USB Serial Port (COM3)) . find your device under (e.g.
Right-click it and choose > Port Settings > Advanced . Change the COM Port Number to COM1 .