Go to the tab and select Hardware Ids from the dropdown. Look for a string like PCI\VEN_4651&DEV_3473 .
If your computer shows an "Unknown Device" or "PCI Serial Port" with a yellow exclamation mark, you can find the exact driver by its Hardware ID: Open . Right-click the unknown device and select Properties .
This usually means the driver is incorrect for your specific hardware revision. Double-check the Vendor (VEN) and Device (DEV) IDs.
Several archive sites and manufacturers still host these drivers: