Some intellisense not working in MVC 4

Hi,

I've been given a new desktop at work and have VS 2012 and MVC 4 installed on it.  When I create a new MVC project some intellisense doesn't load when inside a view.

When I try and use @Html.RenderPartial, all I get from Intellisense is RadioButton!

I've tried opening a new project and get the same so its not just a corrupt project.  I've opened a project that was created on another machine and get intellisense for the above method.

Has anyone come accross this?  know a fix?

Thanks,

Tony