Windows Movie Maker 2012 direct Link
Windows Movie Maker is a video editing tool for Windows that is free from the Windows XP and the user can edit the video easily and quickly just drag and drop.
has features like video effects, video transitions, adding titles / credits, audio track, timeline narration, and Auto Movie. very easy
Note: Windows Server 2008 Service Pack 2 and Platform Update are required to run Windows Live Movie Maker 2011.