To download the correct ZyXEL Wireless N USB Adapter driver matching your hardware - we strongly recommend using a reputable driver update utility such as Driver Genius which can instantly scan your system and detect any hardware device you've installed, while matching each of them with the most current official manufacturer driver.
This automatic update tool will let you run a free scan, while listing all drivers found to be missing or out of date (not only the missing ZyXEL Wireless N USB Adapter driver you are currently worried about). Next - it will instantly locate the proper ZyXEL Wireless N USB Adapter hardware driver, and any other driver you need, download and install it onto your system - giving you optimum performance & speed. This entire process takes under 2 minutes.
Caution: in order to prevent hard drive crashes, device driver conflicts and fatal error messages - you should make sure the ZyXEL Wireless N USB Adapter driver you install on your system - is the proper driver matching your hardware needs.