Wow. Just spent 1 hour online with tech suppot. Two D link wireless adaptors have failed to install into my new hard drive with Windows 7 OS. I questioned the compatibility of Windows 7 with their product nd asked senior tech support if this was a commonly repored problem. They assured me that it wasn't often reported. That is untrue, as I now see on doing a google search and finding this blog. My first D link worked okay for about 3 months with Windows 7, but then suddenly failed and thinking it was a hardware problem I replaced it with another DWA 120. After trying to load the driver with the cd provided, and it not loading, I called tech support, was put on hold for a long time, then their eventual help proved utterly useless. The rude tech support person said she was explaining to me when I interupted her....hmmmm....I guess they don't want to admit their product doesn't work with Windows 7. I won't buy another thing from D link and am returning both their bad devices for a refund.
Simply put..D Link DWA A-120 does not work with Windows 7. Online versions of the driver are useless.