Problem after Reinstall (Windows 2000)

This is a small office network, 2 running XP, 2 running Win2000. I reinstalled because we had an employee that had a bunch of junk on it and we could not reach Windows Update. I did a clean install and everything runs fine EXCEPT Windows update, can't connect to microsoft.com, mozilla.com. I can get to Yahoo & Google and a few local site. Downloaded and tried every suggestion from MS Knowledge base on connecting to Windows Update. Even went as far as turning the firewall off long enough to see if something was blocking it from going out. We can reach microsoft and WU from any of the other 3 computers.

Does anyone have any ideas of suggestions? Now that I reinstalled, I need to bring it up to date with service packs.
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