scary music,shocking
If you are referring to "Sound Effects" then the answer is yes, you can buy sound effects online. There are also sites that offer free sound effects packages that you can use without a licence.
boring the sound and sound effects add to the horror in a scary movie.
with the computer sound effects and sometimes with mouth effects
Sound effects are all sounds that are aded to the movie later, and not picked up during the initial recording. If an explosion isn't loud or long enough a bigger bang can be added on later, as a sound effect.
Rehanfx has many plug-in effects for Windows Movie Maker. You should check the site out to search for an echo effect:http://www.rehanfx.org/
There are lots of sound sites on the web...Google: sound effects.I personally like 'Sound America' myself. Lots of cool sound effects with hundreds of categories to choose from.
Try 'Sound America' for a wolf sound. (Google Sound America for the link). Audio in .wma or .mp3 format can be imported/edited in Windows Movie Maker.
music
There are two tracks of audio for Windows Movie Maker. One track for the audio in the video you imported and another to add sound effects or a musical overlay. If you want to have both a musical overlay and sound effects, you just have to create your video with the music overlay or sound effects that you want first. Then, re-import the completed video with the sound effects or music overlay on it, and you'll you have fresh audio track to add whatever you want again. This is a "dirty" way to add as many sound tracks as you want using Moviemaker.
Newton's Apple - 1983 Movie Sound Effects Sun Globetrotters Hedgehog 12-6 was released on: USA: 20 November 1994
A way of making a sound like thunder
Movie from 1998 won 3 Oscars: - Best Effects, Visual Effects - Best Effects, Sound Effects Editing - Best Film Editing