Windows Movie Maker 12 audio not syncing correctly, and not synced in full screen mode

When I am making a video I have the audio and pictures/video together. I have fitted the pictures/video so I could see the whole audio. I am trying to cue text with the audio, when I do the audio is in a different spot to how I hear it and where it is displayed on the screen. I have to keep going back to the beginning to get the timings right. Also when I preview my movie in full screen mode the timings are off, while they aren't if I watch it in the editing screen. Any answers will be greatly appreciated! Thanks.