Wireless not connecting to internet

I'm having a frustrating problem that I hope someone can help me solve. On 3 separate occasions, I have suddenly lost access to internet or e-mail using AirPort to access my home wireless network (using a D-Link router). It seems to happen after the network has gone down for some reason--after I reboot the router I can get onto the internet with other computers, just not the one using AirPort in MacOS 10.5.1. Apple's network diagnostics asks me for a WEP password to access the network, but I haven't set a password for the network. I am able to access the network using other devices (like my iPhone), and the internet works just fine on when I reboot this computer in Windows--it just won't work using the Mac OS. The computer tells me I am connected to the wireless network, but no internet. I am able to get the internet working again by using TimeLine to restore the system to its last working state, but that takes a couple of hours each time. Any suggestions?

I'm having a similar problem. I was successfully connected to the internet wirelessly through a Belkin router/modem. I'm having problems with an Airport Xpress that I'm trying to set up for Airtunes so plugged that into my laptop via ethernet.
Now, whenever I use Network diagnostics to try and connect the laptop it says "see administrator" and asks for a password (no password on the Belkin at the moment). My mates laptop can access the internet through my wireless network no problem. What has been changed on my laptop by plugging the Airport Express into in via ethernet? Running OSX10.5.2 on a MacBookPro
I notice that no-one has answered the original question. If someone could help here I'd appreciate it! Even a clue as to where to start looking would be good! Thanks.

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