Driver link is posted on this page but it doesn't work:
There's also a download link posted here
but it doesn't work either.
I suggest you contact the manufacturer if the driver below fails to work. (the website where I found it, did not state what OS's are supported):
Netgear WNA3100 Wireless-N USB Adapter Initial Release Software 126.96.36.199
File name: WNA3100_v188.8.131.52_Setup.exe
File size: 22.8 MB.
I was unable to locate any other driver on any website.