Visual Studio (or VSTA) does not start when editing .vbproj

Anybody have the problem where: "TOOLS, MACRO, EDIT" does not start VSTA or Visual Studio, even though you have done that many times before? It works if I try "TOOLS, MACRO, NEW". I think that I may have gotten around it once before by copying the code from opening it it Visual Studio, then using Tools, Macro, New and pasting the code. But now that I am into it with forms and controls, etc., I need it to open from SWX or some reference is missing and VS alone won't build the project. Thanks in advance.