Error occurred when opening my ASP.NET Core Project

The error is:

--------------------------- Microsoft Visual Studio --------------------------

The following error occurred attempting to run the project model server process (1.0.0-preview3-004056).

Unable to start the process. Found dotnet SDK, but did not find dotnet.dll at [C:\Program Files\dotnet\sdk\1.0.0-preview3-004056\dotnet.dll]

I removed that version because it wasn't the version i wanted. Now I try installing the latest version and re-installing the latest version. Even tried to install an older version but still get this error when opening the the project. When I run dotnetcore --version i get this:

C:\Windows\system32>dotnet --version

Found dotnet SDK, but did not find dotnet.dll at [C:\Program Files\dotnet\sdk\1. 0.0-preview3-004056\dotnet.dll]

How do I tell dotnet to set a specific version that is already installed?

Edit: I also installed VS 2007 RC on top of VS 2015 Update 3.

Thanks, Patrick