I recently aquired a 64 bit machine and installed 64 bit developer edition of SQL Server.
Upon executing SSIS packages, i recieved the windows error: "A problem caused the application to stop working correctly. Windows will notify you if a solution is available". General error right? After some research, i sovled the problem by changing debugger settings in Visual Stuido.
On the SSIS project properties page, choose "Debugging", and then expand "Debug Options" on the property page. For the property Run64BitRuntime, set it to false, and the problem is solved. All packages that i created in the project, no matter what the configuration was, were recieving this error.
In this case, this setting fixed it.