Thank you for the advice. Unfortunately, while I can pull an IP address, a Primary DNS, and a Secondary DNS from my computer, I do not have access to some of the other security settings on the router (such as the WEP key), because I am using an umbrella network covering my college dorm. Up till now, my DS has been perfectly happy with auto-obtaining everything it has needed to connect to wireless.
The odd thing is, I have not had a problem until now, and my laptop seems to be running off the same wireless network just fine. I also went and tried two other networks bordering mine, but the same exact thing happened. Somehow, I think my DS itself must be messed up.