Newbie question regarding project development in Visual Studio 2005.  
In experimenting with SQL Express 2005 for SQL Server Reporting Services, I
believe only a small runtime component of Visual Studio 2005 necessary for
SSRS report development is installed with SQL Express 2005 per the suggested
companion software download on the SQL Express MSDN website.

I have been assigned responsibility for an existing Visual Studio 2005
(.vbproj) and on attempting to open with my current VS2005, I receive the
error that the Application for .vbproj development is not installed.
My questions are:
1. Can the .vbproj application be added to my current instance of VS2005?
2. If not, can I install VS2005 Professional Ed. over my current VS2005 or
should I remove it and possibly both it and SQL Express 2005 in order to get
a clean install?

This is on a Win XP SP2, Dell Optiplex 745 desktop