Powerpoint, Open Office Impress & IBM Symphony

Well, we attempted this project, but we couldn't find Symphony and didn't want to download Impress (we didn't know if we were allowed to, so we didn't try). What I know is that they are all types of presentation processing software that allow you to create a visual presentation including sound and pictures. Powerpoints' tools are pretty simple to learn and use, but you cannot easily switch to different projects, while in OpenOffice you can, which is nice. I do not know anything about IBM Symphony.