Wireless...

So, I had a D-link router connecting 3 computers together with wires and everything was fine. Yesterday, I got a D-link wireless router...it looks exactly the same except with the antenna. Problem is, it disconnects and reconnects randomly and I can't run things like AIM for more than 10-15 mins straight. Any ideas on how to fix this?

Do you have the lastest firmware installed? either that, or quite possibly, bad router, or just could be the area.