There is a reason for asking posters to give brief details of their equipment when they post, if you had mentioned Netgear WNA3100 . . . However.
"... The network may no longer be in range. Please refresh the list of available networks and try again."
This message normally only appears when an adapter is trying to connect to a router to which it has previously been connected. Which in turn implies (1) it can connect to your router, but (2) there isn't enough signal for it to lock on.
Looking at the specs for the 3100, it says 'small / medium' house, suggesting that it requires a reasonably good signal. Distance is not the only factor. Structural materials and the position of the dongle are also important. Since you probably haven't changed the structure of the building you live in, this leaves the position of the dongle relative to the router. If the dongle is mounted in one of the rear USB slots and the back of the computer is up against a wall you are creating a very difficult signal path. I had this problem, and my photo in post #2 shows how I resolved it.
As a test, you could try either moving the router closer to the computer or, I know it's a pain, temporarily move the computer closer to the router and see what happens.
And you say you downloaded the drivers. Since you have posted in the XP forum, presumably you are running XP. Did you make sure you got the XP drivers ? I know for a fact that the Netgear XP drivers do not work in Win 7, so the reverse is probably true also.