Visual Studio Tools: Visual Studio 2012 not found

Hi. I’ve downloaded Visual Studio 2012 Tools for Unity. I’ve imported the package into Unity.But if I double click a script nothing happens. If I choose “Open In Visual Studio” from the Visual Studio Tools menu , I get a warning “Visual Studio Tools: Visual Studio 2012 not found”.
I have Visual Studio Express 2012 for windows desktop.
Any thoughts?

Visual Studio Tools for Unity does not work with Express versions of VS. It only works with VS Professional or higher.