Airport not connecting to Internet

Hi
I have an Airport network using WPA personal encryption. I've set the mac to log onto my network when booted which it does. When I try to access the Internet, it won't connect. When I check 'Internet Connect' it says that i am logged onto the network, but not the Internet. When i also check airport admin, my airport express does not show up in the window, even after rescanning.
I have to turn off the Airport, then turn it back on again, select my network and after about 20 seconds it says, 'Connected to (my network)" " Connected to the Internet via Ethernet".
I have a windows machine sharing my network which has no problems (which pains me to say!).
Any ideas how to solve this.
Thanks

Take a look at my FAQ:
http://www.macmaps.com/WIFI1048.html

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Welcome to the support community group.
First, are you sure that your AirPort Extreme has been configured correctly and is properly connected to your modem?
Begin by telling us how you have things connected and if the Airport Extreme is replacing a previously owned router or is this an entirely new installation?
First be sure that your modem is working and properly connects you to the internet using an ethernet cable directly connected to your laptop. Once you're sure that's working, reset the AirPort to factory defaults by disconnecting it from power and pressing and holding in the small reset button on the back for 15 - 20 seconds while you reconnect it to power. Then turn everything off for 5 minutes. Connect the Airport to your modem with and ethernet cable to the Airport WAN port on the back (check the user guide to make sure you connect the cable to the correct port) then connect a second ethernet cable between the laptop and one of the LAN ports on the AirPort Extreme.
Then power up the modem first, wait 5 minutes and then power up the Airport, wait 5 minutes and finally power up your laptop.
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Thank you for your response.
I did try turning off the firewall, and reducing all the security levels to a minimum (under Control Panel>Internet Options). Also, I'm using a direct cable from my m/c to the Airport Extreme. But nothing helps. Due to the usage pattern in my family, using the MacBook for configuring the network is not optimal, hence my struggle to do it on my Windows desktop. But if that is the only way to go I suppose I'll have to.
Subsequent to posting my query, I discovered that Apple had not singled me out, and many others with a Win OS face this problem, too. I would have thought Apple would do a proper job of testing before putting up the Windows version of Airport Utlity on their site.
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Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
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10.5.x/10.6.x/10.7.x instructions...
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