The network drivers on the Acer website for the r1600 with Windows XP are corrupt and do not work.
I'm not the only one who struggled with this problem, but I found the solution and will share it, hoping it will resolve frustration for others. The correct drivers are found on the NVIDIA website.
Download and install. It looks a lot like the installer from Acer, except that it works.
The other answers here are generally incorrect and should be ignored.