I work on an open source product called EVEMon written in C# targeting the .NET 2.0 platform, I have one user who is suffering from a strange .NET crash that we have been un
In a nutshell: there is an unhandled exception in the application.
If you have access to the machine (through remote access, etc.), try installing Visual Studio Express and starting the application. You should see a dialog offering the chance to debug the application with a new instance of Visual Studio.
It may also be that there is something preventing Windows Forms from properly initializing. I've seen forum posts that suggest that font issues can cause this -- ensure that the users have the fonts installed that your application needs plus the usual defaults such as MS SansSerif, Arial, Tahoma, Times and suchlike.
And failing that... try sacrificing a chicken over the PC. Works a charm every time!