Symptoms
When you attempt to upgrade a Microsoft Visual Basic 6 project to Visual Basic .NET, and the project contains a UserControl, the Upgrade Wizard may stop responding (hang) or throw an exception.
Specifically, when you perform the upgrade on a Microsoft Windows XP-based computer, the Upgrade Wizard may stop responding. When you upgrade on a Microsoft Windows 2000-based computer, you may receive the following error message:

The exception unknown software exception (0×00000fd) occurred in the application at location 0×20078c3e NOTE: The Visual Basic .NET Upgrade Wizard is included in Visual Studio .NET Professional.
Resolution
This behavior can occur if an instance of the UserControl cited on a form has the same name as the project.