How to Edit videos with Windows Live Movie Maker
To add videos and photos into Windows Movie Maker, on the Home tab, in the Add group, click Add videos and photos. In the dialog box that appears, open the folder that contains the photos or videos that you want to add, select the video files and photos, and then click Open.
To trim a video in Windows Movie Maker, under Video Tools, on the Edit tab, in the Editing group: To set a new start point for the video, drag the slider underneath the preview monitor to the point that you want the video to start, and then click Set start point. To set a new end point for the video, drag the slider underneath the preview monitor to the point that you want the video to stop playing, and then click Set end point.
To clear any new start and end points in Windows Movie Maker so the whole video plays, click a trimmed video in your project. Under Video Tools, on the Edit tab, in the Editing group, click Trim tool. To make the trimmed video play from the beginning again, click the start trim handle underneath the preview monitor, and drag it to the beginning of the video. To make the trimmed video play to the end again, click the end trim handle underneath the preview monitor, and drag it to the end of the video. On the Trim tab, in the Trim group, click Save trim to save the changes you made and to close the trim tool.
To add a plug-in in Windows Movie Maker, after you’re done editing, on the Home tab, in the Sharing group, click the More button, and then click Add a plug-in. Follow the instructions to download and install the publishing plug-in. To publish a movie on a website click the plug-in for the website that you want to publish your movie on. Follow the instructions to publish your movie on that website.
Here is a video explaining how to remove / delete some frames from a movie: