How to debug an executable

Hi,

I run into a dead end with a Windows application written in C#. If I open my source code in Visual Studio 2010 and hit "F5",everything runs fine.

I then build it into a msi installer, then install this application. However, when I run this installed application, it constantly dies with this error message: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." How do I debug this executable?

Please help - customer is pushing for release and I am stuck here. Many thanks!