Wireless & Ethernet network on same computer

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We have an Ethernet network in which all our home computers use. This
computer is the only computer who has direct internet access. So, all
the others come through mine for internet access.

The problem is, I would like to go online with my Nintendo DS. The only
thing is, the USB wifi accessory that nintendo sells does not work. It
kills both the internet, and ethernet card. (It resets the IPs... I
have to disable, unplug the nintendo accessory, set the IPs again by
hand for the ethernet and internet cards, then "repair" both.) I've
tried changing the IP on the nintendo wifi, I've tried bridging
connections with the ethernet card, but nothing seems to work. All it
does it screw with the network. It sets itself to use internet
connection share, so even if I repair the network and internet, the
network users don't have access to the internet. And even then, 98% of
the time, the Nintendo wifi card doesn't connect to begin with.

My main question is, if I were to buy a wireless router, would I have
the same problems? Could I have the wireless "network" and the ethernet
network on the same computer? I have no access to public wifi spots, so
this is my only choice.

.

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