I'm using the student edition of 3ds max, officially licensed by autodesk. I restarted Max to try to get the window to to reappear, but it didn't show.
thinking on it, it might be a program i installed to disable the Autodesk info center, but the info center still appears in Max, so i don't know why it would start at the same time, or even need to, as the program should only change some registry keys.