You must explicitly enable access to the Microsoft Office Visual Basic for Applications project system ...

You must explicitly enable access to the Microsoft Office Visual Basic for Applications project system before you can create or open a Visual Studio Tools for the Microsoft Office System project. By default, access is disabled to help stop the spread of macro viruses. After enabling access, you will still be protected by Microsoft Office macro security levels.

Do you want to allow access to the Visual Basic for Applications project system?

If you want to Turn in manually use the following options from Office