Name: Zyxel AG 320 Driver
Author: Zyxel

Question 1

Install fails or rolls back?

Accepted Answer

The Zyxel AG 320 is a legacy 802.11a/g PCI adapter, so its driver may be unsigned on newer Windows versions. Run the installer as Administrator, use the exact Zyxel package for your Windows version and architecture, and only temporarily disable driver signature enforcement if you trust the source.

Question 2

Adapter not detected?

Accepted Answer

Reseat the PCI card and confirm it appears in Device Manager under Network adapters or Other devices. Check for a yellow warning icon, try another PCI slot, and verify any PCI-to-PCIe adapter supports the card’s slot/voltage requirements.

Question 3

Version conflicts or no Wi-Fi?

Accepted Answer

Remove older AG 320 driver entries and any existing Zyxel wireless utility, reboot, then install one driver package only. Avoid running Windows’ wireless manager and the Zyxel utility simultaneously if the utility requires exclusive control.