microsoft .NET framework alert

everytime i restart/turn on my computer this window comes up labeled "Microsoft .NET Framework"

The window goes on to say:

"An unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will be shut down immediately."

I have just been pressing quit, but the window has still been coming up for some time now.

Thanks for any suggestions!