Limited Internet Connectivity - 10.4.11 Airport wifi

Hi,
I have searched and can't find this exact problem. I had an internet connectivity problem after one of the more recent updates, and to fix it I had to enter the following DNS addresses in the network preferences:
208.67.222.222
208.67.220.220
Using both Firefox and Safari, I receive the "can't connect to the server" error no matter what website I choose (including 17.254.3.183). What is weird is:
I AM ABLE TO CONNECT TO WEBSITES THAT USE HTTPS:// on both Firefox and Safari - right now I am surfing around the citibank site and it appears to work normally. But, clicking amazon.com, google, etc., gives me "safari can't connect to the server" error. At first I thought that maybe it was showing me the cached page, but I emptied the browser cache and went back to the citibank site and it works, so does https://wachoviacreditcard.com - on both Firefox and Safari.
I am using a windows laptop on this wireless network and it works fine.
Help?

UPDATE -
I searched for "prefereces" in spotlight and deleted all of the preferences that looked like they had to do with networking. Re-started the Mac, ran the "network preferences" thing, chose my wifi network, and problem is fixed. What a pain.

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This question was solved.
View Solution.

So, it seems my issue with the Limited Internet connection has been resolved. I didn't use my computer for two days and this afternoon when I turned it on I was still having issues. However, I went into the HP Support Assistant and it popped up that I had some updates to download and install, so I let it do its thing. It took a while because the Internet kept cutting out, but once the update for the Intel Wireless finally installed, my connection has STAYED CONNECTED. Finally!
I don't know why when I went into the wireless properties it said "device is working properly" and when I tried to Update the driver it said "your driver is the latest version" or whatever.
I suggest you go to the HP Support Assistant and check for updates in the "Updates and Tune-Ups" section. It was kind of random, but knock on wood my Wireless connection issue looks to be gone.
Hope this helps
P.S.
Here's a screen shot of what the HP Support Assistant (it is the one with the big question mark logo) main screen looks like :

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I am a new mac user.
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Limited Internet Connectivity - 10.4.11 Airport wifi

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