Welcome to the forum.
You are getting the flexible layout, rather than the default fixed layout. This is something that, unfortunately, very occasionally happens when opening Lightworks for the first time. Please see this sticky for more and how to switch layouts:
www.lwks.com/index.php?option=com_kunena&func=view&catid=26&id=142324&Itemid=81
In future, please use a meaningful subject title, this means that other users will know if they can help or if they've got the same issue as you.