I did send the report but have heard nothing back from Microsoft. The message box is very vague simply saying that Movie Maker has ecountered a problem and needs to close. If, however, one clicks on the technical details of the problem there are masses of "gobbly-de-gook" which is unintelligible. Since posting this thread a couple of days ago I have discovered that someone else with a brand new laptop gets exactly the same message when trying to access Movie Maker. I am wondering if it's something to do with the recently updated Windows Explorer which is the only thing I can think of recently that's been changed on my laptop. Is it possible that there is a widespread problem with Movie Maker that is not confined to my laptop?