Acer One Aspire Shows Connected But Isn't?

My Acer One Aspire wireless connection shows connected but I cant get any Firefox browser to work.

I have a D-link DIR-825 router and it has worked every time except today. I havent used my Netbook very much at home though, maybe a few times a year as I usually take it with me on trips.

I attempted to narrow down the problem. I called D-link as my router was still under warranty. They advised clearing all my old connections and rebooting but I got the same problem. I told them my Sony PS3 works, so they suggested I contact Acer as they think it is not the router. My direct hardwire connection also works.

I then took my Netbook to Best Buy and it worked there. The guy said they can pay a visit to my house as it is probably interference of some sort. This will cost $100. Why would my PS3 work if it was interference? Maybe it�s the proximity of my Netbook to something, but I tried it near my PS3 and it still had the same problem.

Id rather try to solve the problem myself first. I havent changed anything except a modem and Windows 7 updates.