Error thrown by user for add operation

Here are the details of my machine which I am facing problems with, OS: Windows Vista Ultimate, Microsoft Visual Studio 2005, SQL server express edition which comes as a free version with MS Visual Studio.
Now I have already created a Database in SQL express edition and am just trying to integrate it to one of my software applications. When I try to perform and integrate operation I am receiving a pop up.
Error thrown by user for Add operation
My username is a member of local admin and I have full administrator rights. I am not sure why this error message keeps coming up. Has anyone come across this error message?
