I've got DNS problems with certain domain names, e.g. "answers.microsoft.com". The behavior is consistent across browsers: all of them complain "unable to resolve the host name". If I open a command line and type "ping -4 answers.microsoft.com", ping resolves the IP address, and the web site starts working in all browsers.
Windows 7 x64 worked great on the same hardware with the same router settings.
Any ideas how to fix?