I don't think I would be able to "see" other networks if I hadn't.
You're right about that, if you're able to scan, the card is at least functional. I had missed that in your first post.
At this point we're kind of lacking in information. What have you tried so far, and what have been the results? It might be helpful to post the output of iwconfig along with a description of how you've entered needed info like the SSID. I would also take a look at the iwconfig man page and try configuring by hand. Sometimes network managers mask important error messages that iwconfig lets through.