I've been using movie maker since a long time now . As i was starting a new project i clicked on preview fullscreen , what happened next was that, the movie did played in fullscreen but there was a one inch black border surrounded by it and thus it saved the movie same way. I have worked on many projects before ,but never have i encountered with such a problem . In my earlier projects the fullscreen preview was working fine without any additional borders even after saving the movie . I've tried re-installing the movie maker but nothing changed . So as to continue my work I used another PC's movie maker and was working fine . I don't understand why this is happening to my PC only . 

For e.g.  I am attaching the screenshot of preview in fullscreen.

Please suggest a solution as I need to continue my projects.

Thank you