无法调试或运行Word AddIn，因为没有安装Microsoft Office所需的版本。

I need to work on an existing Word 2007 addIn project that's a part of a MSVS 2008 solution. However, when I try to debug the addIn, I get the following error message: "You cannot debug or run this project, because the required version of the Microsoft Office application is not installed". I have Office 2007 installed.I need to work on an existing Word 2007 addIn p