how to set video recorder

i checked the video recorder in the test setting for recording th开发者_StackOverflow社区e automatic test in the end of the test i got an error in test result "video recording cannot be created"

did i miss something

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Install Service Pack 1: http://www.microsoft.com/en-us/download/details.aspx?id=23691

Install Expression Encoder 4: http://www.microsoft.com/en-us/download/details.aspx?id=18974

Try again and good luck!

Source: http://social.msdn.microsoft.com/Forums/eu/vsautotest/thread/de112116-9421-4d20-8e4b-6821ce3845e3