Can't load certain WEB pages via a wireless internet connection

I have a 17 inch PowerBook G4 running OS X 10.4.8 and am unable to get to certain WEB sites such as Microsoft.com. I have no problem getting to and loading most other WEB sites using Safari, Netscape or Firefox browsers with this computer. I also have 15 inch PowerBook G4 that is running OS X 10.3.9. The 15 inch computer has no problem getting to and loading WEB pages at sites I'm unable to open with my 17 inch G4. My connection to the internet is via a wireless network using Apple's Airport Extreme Basestation to connect to the DSL modem. When I connect my 17 inch G4 directly to the modem, I have no problem loading WEB pages I could not previously load using my wireless network. I trashed the System Configuration folder in the Library/Preferences directory, but this made no difference to my problem.
Does anyone have any idea as to what is going on?

Are you using the latest Airport driver (check via Software Update)?
Have you tried resetting the Airport unit via AirPort Admin Utility.app in your Applications/Utilities folder?

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