The exception occurred in the NIMax process in the function (Unknown). See this file for details: D:\Profiles\All Users\Application Data\National Instruments\MAX\Logs\20100512_175845-NIMax-00001778.log
As they say, the devil is in the details, and we prefer not to keep guessing. What were you doing at the time? What is your operating system? What does the log indicate? Can you upload the log? Once you provide some details, then perhaps someone can try to help you.