After putting in the latest Visual Studio 2010 security updates on our Vista test machine, the Test project failed to start because it couldn't register the HTTP namespace reservation for WCF (web services). If you continue following this error, then the Test Studio will not be able to find the browser to execute the tests under and although you'll be able to record, you cannot execute a test that you created.
Searching the internet, I found the following command that you can run in the command prompt when run as administrator, but that didn't always work.
netsh http add urlacl url=http://+:80/MyFirstService user=MyComputer\MyUsername
So we found that if you start Visual Studio as an administrator it will work just fine.
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