Yeah, what kakuloo said.
Also . . . make sure that if you have your encryption/security set that it is on "WEP", the DS doesn't like WPA. Either manually enter a security code, or have it generate a random one. Then do the WiFi set up on your game. (I recommend against setting your router to no security - anyone can get onto your router, surf then net, and, depending on how you've shared files on your computer, just randomly browse, steal, delete, hack etc . . . all of your files.)
I usually end up switching my WiFi security back & forth. If I'm using my DS, I set the WiFi to WEP security. When I'm done, I switch back to WPA (which is, supposedly, a bit better).
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