I received this error today and I thought, "what application is crashing"? It wasn't hard to find out -- I just had to look at the taskbar to see which application was highlighted. But, it would be easier if a fatal error message had the name of the application in the title or text somewhere. When will application programmers adopt a culture of ensuring, where-ever possible, that crashes provide informative feedback? I guess they tried to diagnose the problem here with the suggestion that maybe another instance of the program was already running under another user.