Should be able to click on 'Import video' to get a clip into the program.
You can rotate video clips in Windows Movie Maker by doing the following:
1. Import the video clip into Windows Movie Maker.
2. Drag the imported video clip and drop it onto the timeline.
3. On the Tools menu, click Video Effects.
4. To rotate the video clip to the right, drag the Rotate 90 video effect and drop it onto the movie on the timeline.
-or-
To rotate the video clip to the left, drag the Rotate 270 video effect and drop it onto the movie on the timeline.
5. On the File menu, click Save Movie File and follow the instructions in the Save Movie Wizard.
Or watch this...
http://www.youtube.com/watch?v=HlqqlS8CDv4