Problem with Powershell references in Visual Studio

I have problems referencing powershell functions from within Visual Studio 2008 or 2010. I have imported the
System.Management.Automation.dll but it still cannot find references to:

        Dim connInfo As WSManConnectionInfo
        Dim mycommand As PSCommand, pscmd As PowerShell
        Dim ws As

Also it cannot find AuthenticationMechanism or RunspaceAvailability so I am unable to build the project

I tried removing and re-adding references with no luck.
I used to work ok before but it lost all the references for some reason. I even went back to an earlier version of the project.
I tried creating a new project with the appropriate references.

Are there different versions of System.Management.Automation.dll ?
 Mine is 6.0.6000.16386 dated 12/01/2007
LVL 21
Peter HutchisonSenior Network Systems SpecialistAsked:
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Peter HutchisonSenior Network Systems SpecialistAuthor Commented:

I reinstalled Windows SDK for Windows 7 and .NET 3.5 SP1 and updated the references.
The DLL has been updated to v6.1.7600 which has the appropriate references in it.

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