Windows Live Movie Maker

I have been trying to use Windows Live Movie Maker for the first time, to rotate a video. The program was installed on a new laptop when purchased, I have not downloaded it.  The problem is when I click on 'add videos and photos' and select my video, it appears in the editing window but not in the clipboard window. No matter what I try it will not appear in that window, but when I click on to rotate it 90 degrees, a grey oblong appears in the clipboard window but no video. I have tried clicking on the play (>) button, the bar moves along the video thumbnail in the editing window, but still nothing in the clipboard view.  I have done everything I can find on various forums, including repairing all Windows Live Essentials, and checking for updates tells me my system is fully up to date.  Any ideas, please?   Thanks in advance