Internet no connectivity

Beyond frustrated and could use some help if anyone has any ideas please. I am connected wirelessly to a wireless-G linsys router that has worked great for 6 months. I have another computer(a pc laptop ) that works fine getting on the internet but for some reason my MAc wont load internet pages. I am using airport and it shows it is connected, signal is strong, I have rebooted and restarted router. I get an error message that says you appear to be connected to the internet correctly but the web page address is not correct. It doesnt matter what webpage you type in it wont load on firefox or safari. It shows the list(lights on side of screen under airport support) as all green except for server and internet(bottom two are red). Out of ideas to try. Doesnt make sense as it was working fine on both computers up until about two weeks ago, went away on business trip, then came back to find not working(rest of family was home so no idea what happened ) It appears to be connecting and thinks it is connected, just wont load any pages. Appreciate any help you have and sorry for the thesis here.

Hi bhighsmith, and a warm welcome to the forums!
Go to System Preferences
Click Network
Highlight AirPort and click Configure...
Choose “By default, join: Preferred networks”
Select your access point and Remove your access point with the minus button.
Launch your keychain access in Utilities and delete your access point keychain entry.
Reboot
Go back to the “By default, join:” page and click the plus this time to add your access point. Enter the correct password, save, reboot.
Then put these numbers in Network>TCP/IP>DNS Servers:, for that Airport Interface...
208.67.222.222
208.67.220.220

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