If you suspect you're having DNS problems then do the following:
1. Check your HOST file - if your HOSTS file contains an incorrect or outdated listing, you won't be able to connect. Even if you don't recall adding listings to a HOSTS file, it still might contain listings because some internet accelerator utilities edit them w/o telling you. Open your HOSTS file with Notepad and see if the site you can't connect to is listed there. If it is, delete the entry, and you should be able to connect.
2. Check your DNS settings - verify that the ip addresses for the DNS servers are correct. If not then double-click the problem connection in the Network Connections folder, choose Support then Details (on Vista and Win 7 click "View Status" next to the connection in the Network and Sharing Center, then click Details), and look at the bottom of the tab to find your DNS servers. If they don't match then go back into the problem connection and click Properties. Then highlight Internet Protocol Version 4 (TCP/IPv4), and choose Properties. Change the DNS servers to the proper ones, or choose "Obtain DNS server address automatically."
3. Flush your DNS cache - ipconfig /flushdns @ command prompt
4. Find out if your ISP is having DNS problems - you might be accessing a downed server, so ping both servers for a response. If none is given then change your DNS servers
5. Reboot router, modem, or access point - many routers and access servers have their own DNS servers built-in
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