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When EP-Launch seems to be triggering some random installation software to run or other unrelated program to start it might be related to the viewers and file extensions. When EP-Launch starts up, it tries to associate certain file extensions and that can sometimes cause a problem. When you go to VIEW.. OPTIONS.. and look at the various "viewers" and the spreadsheet and text editor. If any of them seem to be pointing to some kind of installer for Microsoft Project or else something unexpected? If so, try just clearing that one and see if it fixes the issue.