Restart your computer to flush the DNS cache, it might just be that the DNS list wasn't retrieved correctly or it was corrupt. Try restarting your router too (if you have one). If it still doesn't work you might try to change the DNS servers in your computer/router to the OpenDNS ones: 208.67.222.222 and 208.67.220.220 (more information here.) If you don't want to, or can't do that, then you'll have to wait a few hours for the new DNS updates to be retrieved from the DNS server, assuming none of the other options worked.
Post edited at 7:10 am on Sep. 9, 2008 by marshmellowman
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and victorious in war shall be made glorious in peace.