Visual Studio 2010 throws error Check that the test adapter

Hi ,
I created new project for type mock test in Visual studio 2010 . project get compile success and when begin the test it throws below error
"Error Sample_Test_Function SampleUnitTest The test adapter ('Microsoft.VisualStudio.TestTools.TestTypes.Unit.UnitTestAdapter, Microsoft.VisualStudio.QualityTools.Tips.UnitTest.Adapter, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a') required to execute this test could not be loaded. Check that the test adapter is installed properly. Could not load file or assembly 'Microsoft.VisualStudio.QualityTools.Tips.UnitTest.Adapter, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) "

give your comments or suggestion to solve this issue.
Thanks in advance

thanks
shakumar